"Truck" could be anything from a Tacoma to a full size Kenworth with a sleeper cabin and extended bed. Successful tractor trailer drivers up here do their own maintenance. In their own shop, at home. FWIW my wife drives a Rav4, +/- 1800 lbs, I don't do anything special for that. If this truck that the OP is talking about is 10k pounds of Peterbuilt that has been out all day at +32 dF we basically have a 5 ton refrigeration system in a daily death match with a wood stove. It isn't specified, but even a panel truck full of mac tools or plumbing equipment out in the cold all day I personally would thermally decouple the house from the shop and put a whopper non cat in the shop. Get home, light the big non cat, let the air in the shop get up to 100, 110 dF above, come back after dinner and a shower when the air in the shop and the truck are both around 75dF... With a 16 foot ceiling in the shop they could fit a whopper OTR tractor in there.