Arctic Fox is brand makes 4 season TT but you wont find many single axel trailers that would be built to that standard. Many TTs only have tarp type material on underside. One could use/attach foam board to an aluminium skinned under belly. I looked at older HR Navigator the under belly was harder spray foamed that was undercoating . The really solid fiberglass bay doors also were foamed.
Without heating, insulation only slows transfer of heat. Long term below freezing stuff will freeze. Most TTs have exposed dump pipes. They could be foam pipe insulated and have heat tape applied . Need 5-7 watts a foot . PVC pipe need heat trace attached with foil tape.
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95 Monaco Crown Royale
M11 400hp, 4060 trans.
Aquahot, Generac Guardian7.5k
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