Additional info: the trailer will be stored in a paved parking lot that gets plowed, but the trailer would still have snow piled around it from time to time. Expected storage time each year would start sometime between November and early January; we would start using it again late March to sometime in April. It's Maine, so it gets windy... No electric available at the lot. The lot is on the mainland; we live on a nearby island, but we go to the mainland a few times per week, so we can check on the trailer from time to time. We used to have an Airstream Basecamp 20x; it was stolen, which has led to our purchase of the Oliver. On occasion with the Basecamp we would use the trailer for an "on the mainland overnight" if our plans didn't line up with the ferry schedule to get home. It would be nice to be able to use the propane heat on such occasions, but the plumbing will have all been winterized.
My thought is that if I can design a flow thru into the shrink wrap and just wrap the top half of the trailer, then that would be adequate protection from any snow damage / snow and ice accumulation on the roof. Ventilation would be 2" foam blocks spaced around the lower edge of the shrink-wrap, with 5 or 6 rain protected vents towards the top of the wrap. There would also be a "boom" to hold the top of the wrap above the a/c, vents, etc - which would allow us to crack the vent in the trailer to help avoid condensation.
