Snow load on roof

I got stuck one place last year because of 4" ice on the top of the slide outs (freezing rain). I couldn't get the slide in to leave. I didn't have a ladder or any tool to scrap off the ice (like poncho62 mentions). I had to go get some help with a ladder and something to shove the ice off 3 slides. No way was I going to stand on the roof with ice on it. I got caught because the weather was not predicting rain before getting down to 15-20 degrees. Plus, I saw 45 degree days coming up the next few days. That didn't help because it was only above freezing about 4 hrs which barely melted anything. Anyway, I'd recommend watching the weather and keeping the slides in as much as possible (if you want to move that is). That or get a roof rake. The only reason I mention this is because it sounds like you are talking about using your trailer (not just storing it). I've been camping many times in the snow and love it. Good luck!