My 2012 Ram 2500 will the 5.7 Hemi occasionally has a burning oil smell and a small amount of smoke coming from the rear drivers side wheel well after a long trip pulling my camper. It doesn't do it when I drive it unloaded or on short trips, but it does do it on longer hauls like today's 3 hr trip. I don't see any evidence of my rear end leaking oil through the seal and the brakes look fine. Anyone have a clue what it could be? Oil level looks fine too on the dipstick. I'm not aware of anything on the drivers side rear end that could be doing it.