We also have an 831RKSS and love it. Actually taking it out tomorrow for it's first trip of 2011. We haven't had to level it side to side yet but the 1x-2x board method seems like it works fairly well for others.
2010 Flagstaff 831RKSS.
2000 Excursion Limited PowerStroke Diesel- ATS ported housing, Riffraff's FRx, HPx & I/C boot kit, DiPricol Optix- Pyro/Boost/Trans, DP Tuner-80t, Drive-Thru, 80e, 120race, K&N intake tube w/6637, Exhaust, AIH delete, Foil delete, 4" lift, Airbags, Dunlop Rover M/TMaxx 315/75/16's, '04 headlights.