990 Arctic Fox

I agree with the above guys on Stable loads

Stable loads from http://www.torklift.com/index.php/products/suspension/stableload

I did the upper overloads. $183 from http://tweetys.com/search.aspx?find=stableloads I see they are $195 now you'll have to ask on the year for your truck.

I had a little front to back rock, or jittering I called it. I put them on myself and took care of the problem. I didn't think I had any side to side sway problem because I know there would be a little but it stiffened that up to really nothing. Plus you never have to worry about air bags leaking, their just a solid chunk of rubber.

Good Luck.

If you need a sway bar for the back or want bigger ones:

http://roadmasterinc.com/products/rss/sway_bar.html

http://www.hellwigproducts.com/products/sway-control/truck-suv-sway-bars/

Is this a '99 model truck or a 2015 or what?
You may not need anything if it's 2011 or newer. I'd drive it first and see how it does.

Stableloads.

I have them and they are far more useful than the airbags I installed first.

09 3500HD Dually, Arctic Fox 811.

What year is your truck?

i did not do anything to my 3500 drw ram, with our 990 artic fox, and it rides nice, but i do slow down around curves, try it first, good luck and have fun

You need to try it first and see if you are satisfied with how it feels.

I'm satisfied with air bags and a sway bar but it road pretty good without either.

+1 on stable loads.. That all I needed..

I'd start with Stable Loads. Might be all you need: http://www.torklift.com/index.php/products/suspension/stableload