We went from MN to Lake of the ozarks 2 years ago, don't recall any hills of note anywhere during the trip.
The hills going to tablerock are much bigger. That said, we've been pulling a 23' sea ray over those with a 5.3 liter equipped suburban just like your yukon for years with no problems.
The hills around LOZ arent as bad. Take the yukon though, its a better tow vehicle.
Yessir... I think grade says it all. Those TN rollers can be tough... It sounds like I'll see a little of that on the way to LOTO. I don't mind makin' the GMC work for a livin'. I just wanna know beforehand, just how hard that's going to be. I think I've got a pretty good idea what I'm in-store for.