Dodge, Ford and GM all list GVWR (Gross Vehicle Weight Rating) and GCWR (Gross Combinded Weight Rating) numbers. The GCWR is the total weight of truck plus trailer which is what I thought people were getting at with CGVWR (Combined Gross Vehicle Weight Rating). I don't see a difference between the two myself.
In order to answer AKfish's question we need to know BOTH the GVWR and GCWR for his vehicle. If he can get the actual weight of his truck, then that would be subtraced from the GCWR to determine the maximum trailer weight for his vehicle.
Unfortunately this will still not resolve the CDL issue as that appears to be federally mandated in the USA with possible state modifications according to what I have read on TBN. Here in Ontario, if you want to tow a trailer weighing more than 10,000 pounds, you must have either an "AZ" license (which is what tractor trailer drivers have) or there is now a "Restricted A" for those of us who tow more than 10,000 pounds but do not want the hassle of maintaining air brake certification and a log book.
Lauren