Depends a lot on what's included in the 4-season kit. If it includes dual-pane windows, better insulation then it is worth it. If it's simply ducted heating to the tanks then not worth it. My current truck camper is 4-season rated and the furnace runs a lot less than the old one did.
I camp in the winter but just leave the unit winterized and live out of a jug, if we need the toilet then flush it with antifreeze. Finding a dump station in the winter can be tricky though so we try not to use it.
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