Well that Corvette will make you hate working on cars itself. It’s the most difficult to work on GM ever built. My neighbor has a Z06 and while it’s great to look at, that’s all I’d want to do. Everything is so crammed in that in order to get to one thing you need to disassemble half the car. There’s zero room for hands or tools.
As far as the Tahoe, it could be uses as a learning tool for your kids, to get them involved in taking care of their own vehicles. Unless you plan on buying new vehicles for them, they’re going to be driving used ones and you know those will need maintenance so you’re back in the same situation only multiplied. And yes, at 150k there are several preventive maintenance items that should be knocked out. These can be done on your schedule so you’re not doing them when it’s inconvenient. If you go this route, you could start a thread asking members here what’s advised as far as that preventive maintenance. My truck currently sits at 170k and everything I can think of preventive wise has been replaced and I have no question it will go another 200-300k with only basic wear items. I’m old enough (63) that I’ll probably never even wear it out.