I have a 5X8 trailer I picked up used for $2500 loaded. Trailer was bought new from a big detail training company. I use 2 10X10 Canopy. Just get a spare tire for the trailer.
If you get generator get one that is quiet. Honda & Yamaha are 2 of the best. The depot has a Genrac that a lot of guys use at the race track with no issues.
Go with the tornado. You can spot clean carpet plus blast dirt out of everywhere. Great for dash vents and cup holders. I use one everyday.
Hope that helps.
Jim
I use a Kranzle K1600. Runs on 110 volts 1.7 gpm. It can run all day. Pumps goes into float mode when not using the gun. Its a little pricey but you get what you pay for. Weighs around 30lbs.