Hello and welcome to AirForums. We are glad to have you with us. I hope you enjoy your trailer. My trailer is a 2013 25FB twin Flying Cloud with 50,000 happy miles on it.
Airstreams rarely get damaged by the weight of snow, but it can happen. The one case I remember here on AirForums was someone from Ontario who bought a vintage trailer in need of an overhaul. He gutted the interior, removed the interior skins, and then re-did the exterior--resealing the seams and polishing it to a glorious shine. Then he went to Florida for the winter, and the trailer collapsed due to heavy snow. I don't know if the removal of interior skins was relevant to the situation.
Anyway, Sun Valley can get heavy snow accumulations. I would recommend that you clear it off when it gets deep. I would use a step ladder and a push broom.
Also, it would be a good idea to check for moisture inside the trailer when you have a warm spell after snow has been sitting on the trailer. The snow can dam up the meltwater and maybe give you a leak via a route that would not be a problem for rainwater.
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