I wouldn't be too thrilled with having a bunk over my bed, if nothing else.
Depending on what's wrong with it, you can plan on spending at least $1500 just getting the older camper up to speed. The kitchen is pretty nice, but you don't really need that much kitchen. Especially if you cook outside. I've had a class 'A' and two TT's and have never used the oven in any of them. Inside cooking is pretty much limited to microwave. Everything else is outside. Keeps the heat and mess down inside.
Properly maintained, a camper can last indefinitely. The problem is, people start out with good intentions, but the time, effort, and cost associated with things like sealing the roof get to be burdensome, so the maintenance items slide a bit, until one day, it starts leaking, which may not even get noticed until a lot of damage is done.
I'd go with the new one.
