I am towing a 29' Terry Resort (6700lbs loaded) with a 1991 Chevy G30 Sportvan (8-lug, one ton). My total vehicle and trailer weight is just over 12K. I contacted GM and they told me that based upon my VIN # my tow capacity is 2000lbs. This just seems inaccurate. I have no problem rolling down the road at 65-70mph (hills can be a challenge). I have 10K hitch, a weight distribution rig and an over-sized tranny cooler. This is the 5.7L 350 passenger model. I'm just looking for some peace of mind before I set out on 6000 mile trip. I can't find anything on the web and I don't have the owners manual. Thoughts?