My name is Kenn and I am building a motorhome on a 1982 Peterbilt 359. The box will be 20' and have a bunk over the truck cab. The truck has a Cummins 450 and a 13 speed. The wheelbase is 243". The overall length will be just over 30'. I have been working at getting the truck ready and learning a great deal about old trucks. I have had the front drive axle removed and new drive shafts built. I relocated the exhaust under the truck. I look forward what everyone has to say.