I mainly use a 14' trailer w 5200 lb axles with brakes. Alkota 5GPM 4000psi unit with 525 gal tank. Also four 35 gal chemical tanks w chemical wand/pump hard mounted.
Also have a couple portable/bed units with 225 tanks.
Real easy with toolboxes hose reels, etc on the trailer. Also the chemical gun and tanks is very handy.