5th wheel verses travel trailer

I had a dealer tell me my truck could pull anything on the lot... I have a Duramax 2500 - he tried to tell me that is was the same as a 1 ton and could pull anything, a dually is only necessary for a in bed camper, a SRW has more payload then a dually due to overall weight of the truck...

Here is the reason Salesmen are bad. They think that because you have the Diesel your payload is not effected by the trucks suspension. I'm sure he would tell me I just need airbags to pull the 40' toy hauler...