We have been lurking for the last month and have picked up lots of good information. We are now seriously considering the purchase of a motor home built on a class 8 chassis such as those built by Haulmark, Renegade, Show Hauler, etc. Most of these builders appear to use Freightliner chassis but appear to offer choices between model of truck and engines. We are trying to determine the pros and cons of Columbia vs. Coronado and Detroit 60 vs. MBE 4000. Please share your thoughts and experiences with us.