How many of us are there? Owners of Dodge based RV's?

So I bought a '76 Dodge based Chinook to tour the lower 48 this Winter. First RV We've had since early 70's 25 years ago (class A Explorer).

We took it to our mechanic to get ready for the trip. It turns out he has a one year newer (I think a Sportsman) that he has hopped up. It looks like about 28 feet long. 525 horsepower. He says it will go well over 120 mph. To quote, "It'll go faster, but I won't." At that speed it starts rocking. I guess he does a lot of speed work for people.