Catching up on TWC and the snow belt mess this afternoon and they gave some interesting info re snow load. There is usually at least one post re "should I or not" every year, so here it is early....u...
And remember .. whatever the weight really is, it's spread out over that square foot. I've had my 225 lb self up on my roof, walking about, and that's all 225 lb concentrated in the area of my foot! Normal snows shouldn't hurt your trailer. 5' ... if it's 5' on the level, then yes .. clean it off.