I really do not want to put a 4" exhaust port into side of my unit if I do not have to. I would think a lot of issues could come up if not done properly and with the correct cover. Not to say I would not have it done, just that I would want someone who has done this a few hundred times and knows what they are doing.
I also would want a better outside cap/cover one that is better than the el-cheapo household ones. I would think there might be one that can be completely sealed when unit is not in use and yet allows better retention of the R values.
06 King of the Road 37RLQS
06 Coachman Cross Country 5.9L 300HP 382 DS
03 Jeep Wrangler, 4.0L James, Trina, SMSgt, USAF Ret