Geezer - I was definitely pricing out motor mounts afterward just in case. I'll dig in over the weekend and see where it goes. Thanks again for the advice, much appreciated!

Camoit - I thought it was winter condensation at first, but it smells. Not the sweet smell I'd expect of coolant, which is what sent me down the path thinking it might not be a head gasket. But that might have been wishful thinking. Also, it's way more in quantity than it was last winter when I bought the truck. Something's definitely up, unfortunately. I should give the vacuum gauge thing a shot this weekend, just need to get one!

Just want to say I'm grateful for this place and the expertise of the folks here. There's so much more value in personal experience than a shop manual will give you. Looking forward to getting "Frank" back on the road.