A truck mounted pressure washer turns a pickup, flatbed, or service truck into a fully self-contained cleaning rig. Instead of towing a separate trailer, the pressure washer, water tank, hose reels, and accessories mount directly to the truck, freeing up tow capacity and often saving setup time. For mobile cleaning crews that cover a lot of ground, a truck-mounted rig is a powerful, efficient way to carry everything in one package.
Like any mobile rig, a truck mounted setup is only as good as how well the components fit the truck and the work. The right machine, tank size, and layout matter, and weight distribution, load ratings, and safety cannot be ignored. This guide explains what a truck mounted pressure washer is, its parts, pros and cons, when it fits, and how to build or buy one safely and effectively.
What Is a Truck Mounted Pressure Washer?
A truck mounted pressure washer installs the cleaning system directly onto the truck’s frame, bed, or service body. The core is a pressure washer, often gas, diesel, or hot-water, paired with a water tank, a feed pump to move water from tank to the pressure pump, hose reels, and storage for wands, nozzles, and chemicals. Everything rides with the truck, so there is no trailer to hook up or park.
This format suits operators who need to move quickly between jobs or who already run service trucks. By keeping the rig on the truck, you free up hitch capacity, avoid trailer storage, and can often get into tighter spaces where a trailer would be awkward. The tradeoff is using the truck’s payload, which is limited, so every pound counts. Weight must be distributed and secured, and the truck must be rated to carry the loaded rig safely.
Truck mounted rigs come in two main styles. A skid unit bolts to the bed and can sometimes be removed, giving some flexibility. A permanent installation in a service body or utility body integrates the system with compartments and is built for daily commercial use. Either way, the goal is the same: a complete cleaning rig you can drive to the job and start working.
Key Components of a Truck Mounted Rig
A functional truck mounted rig brings together several parts that must work as a system.
| Component | Purpose |
|---|---|
| Truck (pickup, flatbed, service body) | Mobile platform with payload and space |
| Pressure washer (cold or hot water) | Core cleaning power |
| Water tank | Supplies water when no faucet exists |
| Feed pump and battery | Moves water from tank to pressure pump |
| Hose reels and high-pressure hose | Stores and deploys hose |
| Fuel tank (if needed) | Fuels engine or burner |
| Compartments and storage | Holds accessories and chemicals |
The pressure washer must be matched to the work: cold water for general cleaning, or hot water for grease, oil, and heavy commercial jobs. The tank size must balance capacity against payload, because water is heavy and a large tank can quickly eat up a truck’s carrying capacity. The feed pump must supply the pressure washer’s flow rate, or the main pump will cavitate. Every component must fit the truck’s available space and weight rating. Our guide on skid mounted pressure washer with tank explains how a skid system feeds a pump from a tank.
Truck Mounted vs Trailer Mounted
Choosing between mounting to the truck or pulling a trailer depends on how you work.
| Factor | Truck Mounted | Trailer Mounted |
|---|---|---|
| Mobility | One vehicle, easier to maneuver | Needs towing vehicle, less nimble |
| Setup time | Fast; just park and go | Hook/unhook and park trailer |
| Capacity | Limited by truck payload | Often more capacity on larger trailer |
| Tow capacity | Free for other trailers | Uses truck’s tow rating |
| Storage | Takes truck bed or body | Trailer stored separately |
| Cost | Can be less if reusing truck | Trailer adds cost |
| Best for | Crews needing quick moves | High-volume rigs needing big tanks |
A truck mounted rig is ideal when you need to move fast between jobs and do not want to tow, especially in tight urban areas or when you need the hitch for other equipment. A trailer rig is often better when you need a very large water tank, a big hot-water machine, or more storage than your truck can carry. The truck’s payload is usually the limiting factor: water weighs about 8.34 pounds per gallon, so a 200-gallon tank adds over 1,600 pounds before counting the machine and equipment. For many half-ton pickups, that payload cap means a smaller tank than a trailer could hold. Our guide on buying a skid mounted rig covers sizing considerations.
The truck’s payload also limits how much fuel and chemical you can carry and how many accessories fit. A trailer, by contrast, lets you load far more without touching the truck’s own capacity, since the trailer carries its weight on its own axle. That is why high-volume commercial rigs usually choose a trailer, while crews that value speed and simplicity choose the truck. Neither is universally better; the deciding factors are how much water and equipment you need and how quickly you must move between jobs.
Cold Water vs Hot Water on a Truck
The choice between cold and hot water affects weight, complexity, and the jobs you can take.
A cold-water truck mounted rig is lighter, simpler, and less expensive to buy and maintain. It is perfect for general cleaning like siding, concrete, fences, and vehicles, and it keeps more of your truck’s payload free for tank capacity or accessories. For many operators, a well-sized cold-water rig covers most of their work.
A hot-water rig adds a burner, a coil, and often a larger fuel tank, all of which add weight and require ventilation and more maintenance. The payoff is grease-cutting power for fleet washing, restaurant hoods, oil stains, and heavy equipment. Hot water means fewer chemicals and faster cleaning on greasy surfaces, which pays for itself on commercial jobs. If grease is a regular part of your work, hot water earns its weight; if not, cold water is usually the smarter use of payload. Our guide on the hot water pressure washer trailer build shares principles that also apply to truck mounting.
Building or Buying a Truck Mounted Rig
You can buy a complete truck mounted rig or build one on a skid and install it in your truck. Each path has tradeoffs.
Buying complete means the system is matched, tested, and often warrantied as a package. It saves time and reduces the risk of picking components that do not work together. The downside is cost and less flexibility if your truck is unusual. Buying a skid unit from a reputable maker and installing it is a middle ground: the skid is pre-engineered, and you adapt it to your truck. Our guide on how to buy the right rig offers buying tips that apply here too.
Building your own from parts gives the most control over layout and budget, but requires careful attention to weight, plumbing, electrical, and safety. You must size the feed pump correctly, secure the tank against movement in a crash, run wiring safely, and respect fuel and exhaust requirements. If you are new to mobile rigs, a pre-engineered skid or a complete installation is usually the safer, more reliable choice. Our guide on the mobile pressure washer trailer setup covers layout ideas that translate to trucks.
Truck Mounted vs Skid Mounted
Sometimes the question is not truck versus trailer but truck-mounted versus a skid that could go in the truck or on the ground. A skid mounted pressure washer is a self-contained frame with the machine and tank that can be lifted into a truck bed, dropped onto a trailer, or moved around a fixed location. That modularity is a big advantage.
A permanent truck mounted installation integrates the system into the service body with compartments and plumbing, which is convenient for daily use but less flexible. A skid gives you options: run it in the truck this season and move it to a trailer later, or take it out of the truck to use at a shop. For operators who want flexibility or are not ready to commit to a permanent truck build, a skid is a smart middle step. Our guide on skid mounted pressure washer with tank explains that flexibility.
Types of Trucks Suited for a Mounted Rig
Almost any truck with enough payload can carry a pressure washer rig, but the best choice depends on the work.
A half-ton pickup is the most common starting point. It handles a modest tank and machine well but has limited payload, so tank size and hot-water systems must be kept within its ratings. A three-quarter-ton or one-ton pickup carries more weight and better tolerates a large tank plus a hot-water machine, making it the preferred platform for a serious rig. Flatbeds offer easy mounting and open access, while service bodies and utility bodies add locking compartments and a professional look at the cost of weight and cost.
Van-based rigs suit urban work where maneuverability and weather protection matter, though payload is again the limit. Whatever the platform, the rule is the same: add up the machine, the full tank, the fuel, the water in the hoses, the tools, and the operator, and confirm the total stays within the truck’s gross vehicle weight rating and payload. Exceeding those limits stresses brakes, suspension, and tires, and it is both unsafe and often illegal.
Layout and Plumbing Tips
A little planning in the layout pays off in every job.
Place the water tank over the rear axle or slightly ahead of it, keeping the heaviest weight low and centered for stable handling. Mount the pressure washer where you can reach its controls, oil fill, and filter easily, and where its exhaust vents away from the tank and operators. Position the hose reels at the rear for easy deployment and rerolling, and put chemicals and accessories in compartments where spills will not reach electronics or fuel.
On the plumbing side, size the feed line for the pressure washer’s flow and keep it short and free of sharp bends, since a restricted feed starves the main pump and causes cavitation. Use quality hoses, clamps, and fittings rated for the pressure, and include a filter between the tank and pump to catch debris. Keep the battery and electrical connections protected from water, use proper fusing, and route wiring away from heat and moving parts. A tidy, well-planned layout is safer, easier to maintain, and faster to work from.
Safety, Towing, and Legal Considerations
Truck mounted rigs add load and safety considerations beyond a portable machine.
Weight distribution is critical. Mount heavy components low and as close to the axle as possible to preserve handling and braking. Secure the tank, skid, and reels so nothing can shift during hard braking or a crash. Use proper mounting hardware and consider additional bracing if needed. Protect fuel lines, wiring, and hoses from chafing, and route hot exhaust away from tanks, hoses, and operators.
Braking and handling change with a heavy load, so drive cautiously and allow more stopping distance. Check lights, tire pressure, and securement before each trip. Depending on your location, commercial rigs may need inspections, permits, or commercial registration. Be aware of runoff regulations as well, since cleaning jobs often require controlling where wash water goes. Authorities such as the National Highway Traffic Safety Administration offer general vehicle loading and towing safety guidance, and the EPA publishes information on managing wash water and runoff. Respect those rules, because overloading or poor securement puts you and others at risk.
Maintaining a Truck Mounted Pressure Washer
Routine maintenance keeps the rig reliable and road-ready.
Service the pressure washer as usual: change pump oil, clean the inlet filter, descale hot-water coils, and protect against freezing. Rinse the tank periodically to prevent algae and sediment, keep the feed pump and battery in top shape, and inspect hoses, O-rings, and fittings for leaks and wear. Check reels, mounts, and hardware for loosening from road vibration, and tighten or replace as needed.
The truck itself needs attention under the extra load: check tires, brakes, shocks, and wheel bearings more often than you would with a light load. Inspect electrical connections for corrosion from water and road salt, and winterize the whole system before freezing weather by draining water from the tank, pump, and hoses. A little preventive maintenance avoids costly breakdowns and keeps the rig safe for daily use.
Frequently Asked Questions
What is a truck mounted pressure washer? It is a pressure washer, water tank, and accessories mounted directly to a truck, creating a self-contained mobile cleaning rig with no trailer to tow.
Is a truck mounted rig better than a trailer? It depends. Truck mounted saves tow capacity and speeds moves, but is limited by payload. Trailers often hold larger tanks and more equipment. Choose based on your truck and jobs.
How much weight can I put on my truck? Never exceed your truck’s payload rating or gross vehicle weight rating. Water is heavy, so calculate the total loaded weight including tank, machine, fuel, tools, and people before mounting.
Do I need a hot water truck mounted rig? Only if you regularly clean grease, oil, or heavy commercial grime. Hot water adds weight and cost, so cold water is often the better use of payload for general cleaning.
Can I install a truck mounted pressure washer myself? A pre-engineered skid is manageable for experienced DIYers, but weight distribution, plumbing, wiring, fuel, and safety require care. For most, a professional installation or a complete rig is safest.
How do I feed water from the tank to the pressure washer? Use a feed pump, usually powered by the truck battery or a dedicated system, sized to supply the pressure washer’s flow. Without enough feed flow, the main pump will cavitate and lose pressure.
What size water tank should a truck mounted rig have? Size the tank to your jobs and your truck’s payload. Water weighs about 8.34 pounds per gallon, so a 100-gallon tank adds over 800 pounds. Balance capacity against the truck’s carrying limit.
Is a truck mounted pressure washer illegal if it is too heavy? Yes, exceeding your truck’s gross vehicle weight rating or payload is unsafe and illegal in many jurisdictions. Weigh the truck and loaded rig, and stay within the rated limits.
Can I remove a truck mounted rig later? If it is built on a skid, yes, and you can move it to another truck or a trailer. Permanent service-body installations are harder to remove, so choose the format based on your long-term plans.
How many gallons per minute do I need for a truck mounted rig? Match the pressure washer’s GPM to your work and make sure the feed pump and tank can supply it. Higher flow cleans faster and supports surface cleaners, but it uses water faster and needs a larger tank for the same run time.
Final Thoughts
A truck mounted pressure washer puts a complete cleaning rig at your fingertips without pulling a trailer. It is fast to deploy, frees up tow capacity, and works well for crews that need to move between jobs quickly. The key is matching the system to your truck’s payload and to the work you actually do.
Choose cold or hot water based on whether grease is part of your jobs, size the tank against payload, and secure everything low and well-braced. Whether you buy a complete rig or install a pre-engineered skid, treat weight, braking, and safety as design requirements, not afterthoughts. Do that, and a truck mounted pressure washer becomes a productive, reliable tool that earns its keep on the road.