air bags on truck to prevent porpoising

Some RVs just ride bad no matter what's pulling them! I had a small hybrid that jerked my Chev dually around.
Between the air bags, the 5th AB hitch and the air adjust Rancho shocks, mine rides really good. Each of those gadgets uses air psi to adjust and I can do the bags and shocks from in the cab and each one REALLY makes a difference. The hitch can be adjusted but I keep it set to the indicator line on the hitch. The mfgr. says it might help to change it a little but I haven't tried it yet. I drilled a cross hole thru the hitch moving parts so I can stick a big pin in it and lock it in a level position so I can use my tripod. I took off one day and forgot to pull the pin out and it rode terrible. I knew in less than a block something was way wrong so I know the hitch helps a lot too. I don't think any one thing is a cure-all unless you get really lucky! Craig

Yes I have. I'm over a little on my truck's GVWR but under on all other weights.
My truck handles the 5er very well and the couple of additions I've made have worked out well.

I don't know what the OP's weights are but airbags will definitely make a difference for him.

Sorry, you need more truck for that load, not more springs. Have you ever run across a CAT Scales.

Waste of money. What you really need is more truck. There is nothing you can add that will cure overloading. If you dont believe me, load up and go to a set of scales for some accurate weight numbers. Compare those numbers to your trucks factory GVWR, GCWR, RAWR and you will have the answer.
The only model that I see that comes close is either 37 or 41 feet long. The 37 footer has aa GVWR of just under 14,000 pounds, meaning you likely have a pin weight close to 3000 pounds.

I installed a set of firestone ride-rite air bags on my 2013 Ram 2500 and they do buffer some of the porpoising. I also have the Reese Airbourne Pinbox on my 35' 5th wheel and that helps as well.

I installed the airbags myself in about three hours so the cost was only $300.00. Very easy to do!

The air bags have done an awesome job of keeping the weight off the springs and supporting the load....but I've been thinking about the added benefit of adding an extra spring like you did.
Is that a big project and expensive?

Thanks,
Tony