Mobile homes are built to withstand the wind and snow load for 3 zones. If you (or the previous owner) did your jobs correctly, then only appropriately constructed mobile homes were installed in your park, and you should have nothing to worry about. Of course, mobile homes are 'mobile' and a home may have been moved from a lesser-load area to a higher-load area.
I believe these are the current regulations and map on snow:
BTW, here is the same for wind:
You should ask your local MHA in what wind and snow zone your park is. Then you can check your VINs to make sure your homes are appropriate for your zone. If so, I'd not bother with removing snow, unless you get snow of Biblical proportions.
My 2 cents worth,