In particular a Cummins 300 or 315. I heard that a Cat is largely prohibitive from a cost to service standpoint in many cases. Also, I`m not a big Cat fan. Any info would be appreciated, along with a phone or email of a Cummins rebuild shop of where it can be done on the east coast. Yhere used to be one that I used a couple of times out on Rte. 70 in Missouri, but that was years ago, when i was driving TT.