Posting this for my buddy.. he's got an RV built on a C4500 frame with the LLY engine. Its a 32' RV and he drags a 3,000 lb. trailer, and the its supposedly only got a 3,000 lb. towing capacity so its at its limit. He wants more power out of it for going up hills, getting up to speed, etc. Would a programmer even work on it, or would he even want one? Would propane be a better idea?

moving to LLY Electronics

Personally I would think propane would be perfect for his needs. all the power without the increased EGT's. A tuner will give you power as well, but higher EGT's.. both will increase the mileage, but more so with propane.

lots of benefits of both