I purchased a 92 Oshkosh bread truck a couple of days ago and plan on making it into a basic RV. Today I learned that in California if I am successful in getting the commercial rating changed to an RV rating I will be exempt from smog with the Cummins 4BT. Very good news. Now onto the transformation. I am also thinking of registering in Oregon and have yet to discover the facts there. Any and all advice and information is welcome. Smitho