There has been a healthy and lengthy discussion recently concerning trailer covering. You should check it out. But a synopsis would be:
A) Don’t buy super cheap tarps since they don’t last.
Cover any protrusions (the door hinges, regulator, door handle, roof vent) with a collar or mat to avoid rubbing against the tarpaulin
I’m a 13’ Boler
owner and I have used a medium weight
tarp for several years. The problem that I’ve had over the last couple of winters has been the shape wrap: rectangular tarp vs egg shape= ballooning and the dreaded flapping. My upcoming solution will be to have a tarp or tarps sewn into the egg shape so that there will be less flapping and hopefully less abrasion.
One thing that I have done the last couple of years is to use Bungee cords to fasten the folds of the tarp across the bottom of the Boler
with a modicum of success. Not perfect but they reduced the ballooning and flap.