Coleman Lantern 17B in winter

[aequitas1916]

Has anyone tried cold weather camping in the Coleman Lantern LT 17? I have one and I'm wondering how it would perform in sub-freezing temps, given perhaps a few upgrades.

I'm thinking of holding tank heaters, maybe a heated water supply hose?

I have the electric heater (although the glass fell off when I hit a bump and I have to figure out the fix for that), as well as a propane heater.

I'd like to head up north during the winter, but I'm nervous that spending money trying to make this a 4 season trailer may be a waste.

Has anyone here tried to do that with this particular trailer? What upgrades would you say are necessary? Which are just nice to have?