I know I will catch HE double hockey sticks from the weight police here for saying this but here goes.
If you have the 3/4 ton and don't want to buy a 1 ton then get a set of air bags and call it good. The only difference in your truck and a 1Ton is a set of overloads and a sticker. That truck will tow 16K all day long if it has been properly maintained and still in good order. I have seen it done for years. Splurge on an onboard air control so you can adjust the level to fit the load. Your not in dually country yet so why buy something you don't know
Chris