I drove that one with the Duramax, or else one just like it, about 10 years ago. It was really nice, and I was tempted to buy it, except it was rear heavy. The front sat high because of the weight of the Duramax, and the owner said he had to keep the freshwater tank which is mounted in the front at least half full. I think he was asking 40 or 50 grand at the time.

One thing to be aware of on these is that they are known for a structural issue, sagging in the middle. Because they don't have a frame. It's a fiberglass tube. Most of the restorers jack them up and install a steel frame.
I think they're really cool. But the newer stuff with three slide out rooms really provides for a lot more living space.