Weight requiring duals?

While I agree that DRW truck is one of the best way to go with a heavy fifth wheel. I would like to address a SRW 3/4 or 1 ton truck with 19.5 commercial aluminum or steel wheels and 19.5 tires as an option. Most of us know the real limiting factor is the stock wheel and tires on most trucks. DW and I are considering a large Fifth wheel coming from heavy truck camper. With all the upgrades I have installed on my truck in my profile my 2006 Dodge 2500 quad cab CTD 4x4 long bed which has a pitiful 1958 lb. plus 150 lbs. passenger x 5 has more cargo payload than a 1 ton SRW. The 19.5 vision wheels which are rated at 4500 lbs. each and 19.5 Firestone fd690 load g tires rated at 4545 lbs. at 80 psi. that is 9000 lbs. wheel support and 9090 lbs. load capacity on rear axle. My 11.5 rear axle which is a 1 ton axle is rated at 10,800 lbs. The last 4 years I have carried a 3400 lb. Truck camper and 4000 lb. Lance truck camper which 3800 lbs. is all on rear Axle. Really forget truck camper in on my truck sometimes on my travels. My point is and correct me if I am wrong while I would like to upgrade to a DRW especially the newer trucks One has other options to haul a bigger FW safely.