Hey guys, I've been lurking here for a pretty long piece, trying to glean as much knowledge as possible. I've decided to invest some snow money into a wash trailer and offer home washing as an add on. Mostly because I like to fit into niche markets and not deal with every idiot with an S-10 driving down prices. I already have a customer base to draw on and a marketing plan for this part of the business, and plan on doing a few friends houses first to get a feel for pricing. I plan on building a dedicated trailer from scratch. I am kicking around a few engine options, minimum 13 hp, max 50 hp. Pump wise, I know I need something like 6+ GPM to get the best performance. Still doing my homework on the pump I want. I have a 200g transfer tank to use a buffer/remote location tank. So...my questions: If you were setting up a trailer, what would be some little details to make life easier? I am very picky about having everything look professional, and everything having a place on the trailer. Is there a good place to look for used pumps? I want to do this right, but don't want to have 5 grand wrapped up in this thing. Would you bother having a dedicated high pressure washer on the trailer to use on concrete or is that redundant? I only ask because I already have a 3000 psi washer that I use on equipment, my shop floor, etc. Thanks in advance for any help and all of the information you guys have already shared on this site!