Thanks everyone.
Regarding mileage, my concern is what some of you have mentioned. While 60K miles for a 2012 is high, at least I know the vehicle was being used actively and was driving down the road. Of course there are some potential pitfalls with that logic, but the same could be said for a 2012 unit with 12K miles. Did they even drive it? Thing is, I camp up to 40-50 nights/year with my boys, but we still probably won't put more than 10K miles/year on it, as we don't typically venture too far from home.
You've all mentioned what I expected, and it's the same for travel trailer purchasing. Leaks are my #1 concern, and I know how to inspect for those. Engine & mechanical problems *shouldn't* be big of a concern for a Ford gas engine with less than 75K miles, provided it's been maintained.
The good news is that there are a ton of used rigs out there. Just have to find the right one.