It would be nice if you posted your rig. Anyway, some units, and I know Keystone uses a self-resetting breaker on the slide pump. Early models had a 40 amp, yet the pump can draw up to 80 amps, expecially if the slides stick at all. Mine would work fine if hooked to shore power, but if dry camping for several days the batteries would be down just enough to draw more amps causing the breaker to cut-out. The solution, get another breaker and put in in paralled with the OEM (this is even suggested by Keystone). Just a thought on your problem.
2011 Chevy Silverado 3500HD LT Ext Cab 4x4 Duramax/Allison, 2016 Redwood 39MB, Disc Brakes, Mor/ryde IS, GY 17.5" H tires, 5.5K Onan, Dual ACs, auto level, auto sat dish, stacked washer/dryer, residential fridge, King sleep number. Michelle & Ann