We get about 14' of snow each winter and I use an ADCO cover. I never let more than 6 inches sit on the cover. It works great. I use the ladder cover that came with it to go over the AC unit. Works great. Only downside is if I leave it on when it gets warm with the humidity mold builds fast. So as soon as the snow melts I take it off again until next winter.
ADCO cover cone with a 2 year warranty too.
2010 Starcraft Autumn Ridge 186BH
2012 Dodge Ram 1500 Sport, 5.7L Hemi, 3.92 axle.