I shortened the pipe between the Oasis unit and exhaust pipe, which tucked the exhaust up tighter to the bottom of the coach. I called Oasis and they said it wasn't a heat issue. The exhaust pipe between the unit and pipe is just black gas pipe available at Home Depot. Mine also had a gangly long pipe that vented out between my two passenger slides. I flipped the exhaust around, shortening it by about 6' and routed it out the driver's side.
This is what the finished product looks like. You can see how tight I tucked the unit up under the coach and then shortened the tail pipe, bringing it out the driver's side.