pianotuna - lots of Bolers sat around the grain belt without covers - the winter breezes keep the light weight snow ('scuse my cussin') off :) Suggest park it out in the wind.
If it has to be parked where it can be piled on, suggest a simple tent made from a princess auto poly tarp (colour optional) pitched nice and steep to shed snow ('scuse my cussin') like a chalet roof - new set of challenges to protect the trailer from the spars and riggin' from flappin' and bangin'