Need more rear support for my 72 4x4

[Lugnutt]

Hi, I searched for a topic covering this but couldn't find one. Basically, I have a dead-stock 72 1/2 ton 4x4 short step-side and I'm thinking about pulling a travel trailer once in a while. Some of them have pretty heavy tougue weight and I was wondering what my options would be to add some rear support. I have the stock 2 leaf with the one overload leaf. What about coil-over shocks or do they make air bag systems that can be used in addition to my leafs? I don't want to make any perminent changes that can't be undone later.

I'm hoping you guys can steer me to the best options for my rig.

Thanks,