How much snow on roof OK ?

Last winter WNY State had a record snow fall. Where I live outside of Buffalo we had 81 inches (almost 7 feet) of snow fall in three days (we average 94 inches all winter). After shoveling our driveway because we broke two snow blowers trying to get out, I had to shovel the roof on the house because with drifting there was over 8 feet of snow up there. My wife asked "Aren't you worried about the RV's roof" which is winter stored about one mile from our house. I told the DW I can't worry about it now, that's why we have insurance. A week later I did go check on the rig and everything was fine. However, during last summer I had a bad leak that I think, scary, think that I finally traced to leak to the rear AC unit not being torqued tightened to mfg. specs of 40-50 inch pounds. Leak did not stop until the third tightening to specs after I consulted Dometic's web site. So the roof can hold a heck of a lot a snow weight, especially dry snow. But was my leak the off shoot of the severe winter we had 2014/15 or just coincidence that the poorly tightened AC finally started to leak. That I don't know.