No fat boy here, My trailer has three shur-flo 60 psi 2gpm 12 volts three 3 hundred foot hoses on swivel reels and 4 tanks. I can fill them with stripper, brightener, roof mix, house wash , etc. this trailer can run all three at the same time along with the p/wWow that cleaned up awesome. Are you using the fat boy bandit sprayer?