Not only is this overweight setup an accident looking for a place to happen, the fine print on the insurance will VOID any responsibility on the insurance company's side. Policies state very clearly that the vehicle must be within it's operating specs, this is WAY over the top.
Stupid is as stupid does.
By the way, my PAC BRAKE does an excellent job slowing/holding speed/stopping my 8400# truck pulling 18K#s on 6-8% grades. Using the right gear in combo with the brake IS an awesome setup.
CD