As I got about 15 miles from home after a 600 mile pull with my 8k fifth wheel I started to notice a bit of a hum coming from the rear end of the truck I am not sure where to start looking, could be heated brakes, a rear diff or even transfer case. I have let the truck cool and unloaded it. before taking it for another quick spin. the noise increases from ~10mph till 50 or so before I don't notice it over any of the other truck noise (wheels and motor). IS there a place to look first with the truck, I don't feel that it is trans related because shift points do not affect the noise whatsoever. at first recognition it sounded like possibly a wheel bearing on the trailer or brakes not releaseing on the trailer unfortunatly the trailer is fine and the noise in in the back of the more expensive vehical
Any help will be greatly appreciated.