We towed our 2005 Chevrolet Suburban (2500) wheels down behind our coach for about 25,000 miles. Our Suburban is approved for wheels down towing and we carefully followed the procedures outlined in the owners manual every time we towed it.
We recently had an issue with the Suburban's transfer case; according to the dealer the transfer case fluid was "black", somewhat "burnt" and the transfer case needs to be replaced.
The dealer was adamant that the wheels down towing caused the transfer case to fail prematurely.
I'm curious, has anyone else (besides Jon) had an issue like this, i.e. Damage from wheels down towing notwithstanding the fact that their car or truck is approved for towing?