At this price range, you should be looking exclusively at dual pump units capable of running (2) guns simultaneously.
Assuming you have a powerful enough engine and pumps with a minimum flow rate of 4.0 GPM, these units essentially double your cleaning power and should help cut job times by 30-40%.
While most units at the low end of this price range will not come with a trailer, it often makes sense to spend a few extra thousand dollars to get one that does. While you can put a commercial skid in the back of a pickup, the combined weight of these units and a decent water tank is often more than the average truck can handle.
Buying a pressure washer already mounted on a trailer not only helps make sure you will be able to transport your unit, it will also save you time and cost in plumbing it to a water supply and running pressure lines.
Most trailer mounted skids will come ready to use from the factory, enabling you to start learning your machine as soon as you buy it.
It’s important to note that you will need at least a 400 gallon water tank to avoid running into issues down the line. Combining the fact that some job sites will not have on-site water with the fact that two pumps at 4.0 GPM will drain a 400 gallon tank in about 50 minutes, the more water capacity, the better.
That said, before you go out an buy a 1200 gallon tank, you’ll need to make sure that your tow vehicle is up for the task of towing that much weight.
In calculating your gross trailer weight, you’ll need to add 8 lbs. for each gallon of water you plan to carry. Long story short, it may be time to start looking at a 3500 series truck.
While there are plenty of great prebuilt pressure washing trailers available, you may want to talk to a custom fabricator or a pressure washer builder before making a decision.
Depending on where you live, you may find a local supplier who can build you a better unit for the same price or less.