Originally Posted by RC3
If your considering Ram again and want to go the dulley route consider this. The towing capacity for diesel 2500 and 3500 single or dual rear wheel is the same, 18,000 pounds. Only difference is the payload, 3500 single wheel has a bigger payload than the 2500 and the 3500 dual rear wheel has a bigger payload than the single wheel and 2500. In order to increase towing capacity from 18,000 to 30,000, you would need to get the high output diesel with the Asin transmission. You may want to consider that if you are thinking of upgrading your trailer to a toy hauler in the future. A lot are close too or north of 18,000 pounds. I’m not sure what the other brands do to get higher towing capacity.
The payload is the number you need to calculate appropriate RV. Max tow weights mean absolutely nothing if the truck doesn't have the payload the handle the gross weight.
To tow a 30000lb 5th wheel your truck would need a 6000lb + payload, don't know of any 1 ton dually with a 6k+ payload.
Truck manufacturers use a 20-25' low profile trailer loaded with concrete blocks centered over the axles to determine max tow weights, perfect scenario for the construction industry, but this in NO way compares to hauling a long tall heavy RV.
As mentioned here numerous posts, truck max tow weights & dry RV weights are totally useless for truck/RV combination calculations.
Payload posted on YOUR particular truck, not published literature/brochure, & the appropriate percentages of the GVWR of YOUR particular rv for tongue/pin weights, again not literature nor ANYTHING your dealer may have said about towing weights, are the numbers to get you where you need to be.