So not sure what your best practices are, but this is a shot today before I took the snow off the roof. Second time in 7 days (yeah it's been a crappy winter).
I know several people that store their trailers away from where they live and will go months without seeing it. Would have been catastrophic for me if I'd done that.
Yes, I would get pretty nervous with a big snow load on the roof. If it's deep and it gets rain on it or starts melting, that stuff gets heavy in a hurry. Plus I think a heavy load can make the roof sag between the rafters if left there long enough.
Last year I caught it just in time on my storage building.
I happened to go out there one day and was looking around and noticed one of the ceiling joist was starting to sag and was split.
I got a brace under it and a few more to make the winter. Then pulled what I could off the roof with a snow rake.
2008 Cruiser CF26RK
2013 Ford Eco-Boost
Heavy duty payload - Max tow
And I was worried about NWIN Snow loading. I use a "Snow Board" foam thing to pull snow off trailer roof except near TV antena(worthless thing.)
Neighbors really laugh watching me fight ladder thru drifts & "plowing camper" as they call it. Worst was snowthrower-ing 90' path to road to get trailer to factory this Feb.20th.
I took a foot and half off mine the day before we got a big storm of 12 more with Ice and rain then freeze I left the 6 inches on there that was ice so I didn't get close to the roof itself in feer I would hurt it. Right now all snow is off and we got 4 " yesterday. so far no leakes.
John and Julie
2015 Zinger ZT31SB- 2008 Toyota Tundra