I have yet to see a non insulated trail not condensate when its below below zero steel or aluminum or even 15 above. Put heat to steel or metal that's below 0 and your going to have condensation. You might not see it if your trailer is finished but it's there. Also you'll use a lot less propane and wont need as large of a heater with an insulated trailer.Not the case with my 7x29 uninsulated Aluma. It heats up quick with very little condensation even if I run it all night.
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