I Don't Know What My Truck Can Tow!

I have an 08 1500 MegaCab with the Hemi and 3:73 gears. This truck is in reality a 2500 with slightly less GVWR (8510) vs the 2500 at 8900. This truck has the full eight lug full float rear axles and is very under rated as I tow a 26-27ft 5th wheel loaded at 8000 lbs no problem. I went over the CAT scales this weekend to check my weights again. Truck with me, full of fuel and the hitch was 7080lbs, GCVWR was 15100, but my RAWR was at 4800lbs, which is way under the 6010 RAWR. I had an 04 1500 Quad Cab, full tow Pkg before I found this truck, Night and day difference. It also rides better unloaded than a 2500, I have tried both. Very popular truck if you can find them, only made them for 3 years