I am confused on what weight to use for towing my 2500HD. Do I use curb weight or GVWR? Curb weight is listed at 7384 lbs. GVWR is at 10,000 lbs. If I use curb weight then a Blue Ox 7500 lb rated tow bar would seem to be ok to use. If I use GVWR then I need to step up to 10,000lb rated tow bar. I have no experience in towing, so I am asking you, the experts! Can anyone help?