I am starting up a mobile auto detailing business and have been getting by with just a basic 1800psi electric pressure washer. I’ve now started doing boats and rv’s as well as sometimes doing wooden porches, decks, driveways and single story houses. I need more power definitely but am not sure what to get right now. Some people say 3000psi is needed to be able to wash a 2 story house using those long extension wands but if you are using a tall ladder then that doesnt really matter. But some say to clean a house only about 400-600psi is really needed. I definitely need more power but also need something that can indeed provide the power I need to clean the 2 story houses while also allowing me to safely tone down the pressure enough so I can use it to wash cars and recreational vehicles which will be its primary use. Right now Im looking at the units from Sams Club which are: a Black max 2400psi with a honda engine for only 0, a Black Max 2700psi for 0 or a Simpson 3100psi with Honda engine for 0. Which one would be the best fit for my needs? Thanks!