I guess it matters how much the weight is.
Many say that you get 12" of snow for 1" of rain. So if melting say a pan filled with 6" deep snow melts to just 1/2" depth, you have about that ratio of snow to water.
1 cubic foot of water is about 65 pounds. The RV is 8' wide, so it can be 250 pounds per running foot if 1 foot of water is on the roof. This would be equal to about 12 feet of fluffy snow.
1 foot of fluffy snow would be around 20 pounds per running foot of the RV length.
Yet if you have 3" of snow, then get a sudden 2" of freezing rain that will not wash the snow off the roof, then you could have a problem. I don't think Montana will warm to 33 anytime soon, so nothing to worry about there.
It would be much safer to use a leaf blower to remove the snow from beside the RV, than to climb on it to try to remove it and possibly damage the A/C covers and shower skylight.
Good luck,
Fred.