We have a 2500 Suburban with a tow package. The max towing is 7500 and our GCWR is 14,000. The vehicle weighs 7200 with us in it and a full tank of gas. The trailer dealer said to take off 20% of the max tow rate (down to 6000) due to our altitude in Colorado. He said I could pull a TT that is 5000 unloaded. I was wondering what your thoughts are, since would that mean that our GCWR should drop from 14,000 to 12000 (due to the 20% discount)? If so, aren't we at the GCWR max just with us and our trailer unloaded??? Thanks!