Well,
1. I'm actually rooting for the guy even if I think his strategy is wanked;
2. The important part of this is not the money, but the relationship between time and money. I've been a pretty successful businessman for a long time (you don't get to buy trucks for cash by accident) and there's times in life where the time investment exceeds the financial return. Now if he was going to spend all of his time trying to recoup his expense watching "Bachelorette Island", then yes, he's probably better off spending that time trying to recover some of his truck expense. But there's probably lots of other things more enjoyable, more productive, and more profitable he could be doing than trying to recover a little bit more money by going the lemon route, especially when there are alternatives. He drove the truck 12k miles. He's not going to get every cent back because he's going to get at least a partial offset because he drove the truck that many miles already.
3. It doesn't sound like this process is "relatively short-term inconvenient" to me. As far as I can see, since 30 minutes after driving the vehicle off the lot he's been trying to get things fixed, having people cart him around because he can't fit all his kids in another vehicle, driving over an hour to other dealerships, etc.
As I said earlier, I am just trying to provide an alternative course of action that might be worth considering rather than going all in - but, again, if that's his prerogative, then "Long live Sparta"