[Stocker]

Go for, no worries. You're not crazy, and it's entirely feasible to DD one of these trucks in winter. '71-'72 have factory front disc brakes which I think are a great thing, though some guys don't think are all that important. My '72 was my DD from 1977 into 2009, when I retired. You say you're looking at a good solid truck and I think that's important. I wouldn't feel comfortable with any DD that wasn't in sound mechanical working order.

As far as getting cold there, these things have great heaters, though the defrosters aren't as good as more modern rigs. They're capable enough, but blow onto a single area on each side of the windshield instead of all the way across the windshield. And the trucks are excellent at putting down the power off-road or in snow (I prefer my '72 in bad conditions to our 2005 Tacoma 4x4). Just remember they don't have all the electronic anti-skid nannies -- it's up to the driver to maintain control.

One downside is if your winter roads are salted. You won't find much (if any) corrosion protection on a '67-'72, and it would be a shame to let a good old truck rust away before its time.