If you're considering starting your own pressure washing company or growing an existing business, buying a pre-owned pressure washing trailer would be a smart move. Instead of spending tens of thousands on a new setup, you could find quality pre-owned models that produce the same professional results at a fraction of the cost — if you know how to locate them.
This guide provides information on where to locate pre-owned pressure washing trailers for sale, the inspections you need to perform prior to purchase, how much you should spend, and the warning signs to avoid. Let's go!
What Is a Pressure Washer Trailer?
Pressure washer trailers are designed to be moved from site to site via a trailer. A pressure washer trailer usually has multiple pressure washers (gas & diesel), water tanks (100-500 gallons or more), hose reels, chemical tanks, and sometimes heating sources (generators or heating elements) for use with hot water systems.
These setups are widely used by:
• Professional pressure washing contractors
• Fleet washing companies
• Construction cleaning crews
• Agriculture and equipment cleaning services
• Property maintenance businesses
The trailer format makes it easy to transport equipment from job to job without a truck bed full of gear or multiple trips to fill water.
Why Buy Used Instead of New?
New pressure washer trailers from reputable manufacturers can cost anywhere from $8,000 to $30,000 or more, depending on the size, power output, and features. A used unit in good condition can often be purchased for 30% to 60% less — freeing up capital for marketing, fuel, supplies, and business growth.
Key advantages of buying used:
• Significant cost savings upfront
• Faster ROI on your investment
• Easier to resell if your needs change
• Opportunity to upgrade components over time
• Lower insurance costs in many cases
What to Inspect Before You Buy
This is the most critical part of the buying process. Never purchase a used pressure washer trailer without a thorough inspection — either in person or via a detailed video walkthrough.
1. The Trailer Frame & Structure
• Check for rust, cracks, or bends in the frame
• Inspect the hitch coupler and ball size compatibility
• Test all lights (brake, turn, running lights)
• Check tire condition, tread depth, and sidewalls
• Verify the brakes work (if equipped)
• Look at the floor decking — rot or metal fatigue is a red flag
2. The Pressure Washer Engine(s)
• Start the engine cold and listen for knocking, misfires, or excessive smoke
• Check oil level and color (dark/sludgy = neglect)
• Inspect air filter — should be clean or recently replaced
• Look for oil leaks around the crankcase and gaskets
• Check hours of use if available (commercial engines: under 1,000 hours is ideal)
• Ask for maintenance records if available
3. The Pump
• Run water through the system and check for leaks at fittings and seals
• Verify GPM (gallons per minute) and PSI output with a gauge if possible
• Listen for pulsing or pressure drop — may indicate worn valves or seals
• Inspect the unloader valve — a common wear item
• Look for mineral buildup or damage on inlet/outlet ports
4. The Water Tank
• Check for cracks, discoloration, or chemical staining
• Inspect fittings and bulkhead connections for leaks
• Verify the tank capacity matches the listing
• Smell inside — strong chemical odors may mean improper storage
5. Chemical Injection System
• Test the downstream or upstream injector if equipped
• Check chemical tanks for cracks or residue buildup
• Verify all valves and metering tips are present and functional
Final Thoughts
Buying a used pressure washer trailer can be one of the best financial decisions you make as a contractor or business owner — but only if you go in prepared. Take your time, inspect thoroughly, ask the right questions, and don't let excitement push you into a bad deal.
The best deals aren't always the cheapest ones. A well-maintained trailer from a professional contractor who cared for their equipment is worth paying a little more for than a neglected unit sold at a bargain price.
With the right approach, you can find a powerful, reliable pressure washing rig that serves your business for years to come — all while keeping thousands of dollars in your pocket.
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