I found (last winter) when I had to leave our Trillium
outdoors (without the shelter) that the snow did NOT accumulate when I left a small (cube) heater on (running) inside the trailer. Yes it consumed energy (but was still FAR cheaper than building another garage!), but I had no snow build up to speak of and what snow DID accumulate (in storms) melted off rather nicely.
This ALSO tells me what little insulation rating value there is/are in these little things, but then again we/I are NOT living in these things year round (are we??) LOL!
IF you have a trailer and want to preserve it, what/where does the cost factor come in??