My 2006 33R Bounder was electric. My 2017 36Y Bounder is Hyd. Reservoir is in the 2nd storage bay behind RR wheels on mine. Easiest way is to just take a peek at the jacks. My electrics were square, where as the hyd has round rams.
The way the system works on the current one is the fronts come down 1st and extend a bit, then the rears come down. The rear jacks are what does the side to side leveling, while the fronts just free float equalizing. If mine is level to begin with side to side, I will have a rear jack off the ground at times.
With that said, have you ran yours across a CAT scale by chance?