Did a few upgrades to my trailer from last year. I think this is the smallest pro trailer that is possible:
This is a 4,000 psi, 4gpm machine with 200 feet of pressure hose on 2 reels and 130 feet of supply hose. No buffer tank, I refuse all well water jobs. 8 Gallon chemical tank for my HW mix.
I use it 1.5 days a week in the Spring, Summer and Fall as an add-on to my window cleaning business. By no means am I suggesting that this is a full time rig.
I do love being able to do housewashing curbside now.
Bear in mind before tearing me apart: I am in Canada.