Vintage Big Rig Fever............

Could be yours-
http://tampa.craigslist.org/hdo/cto/4603778401.html

I once saw what I perceived to be about a 5/6 scale Peterbuilt conventional, pulling a 5th wheel RV style trailer. It was in the vendor aisle of a corvette sponsored car show.
Kind of a double/multiple take, as it wasn't that much smaller, but I had to keep looking at it to figure out what wasn't quite right about it.