I'm new to the forum starting today. My situation is similar to VAredRAM's except that I have an '09 Ram 3500HD 4WD SRW pickup. I made an assumption that I'd be able to carry the AF990 w/o any issues...
I would also consider shocks and making sure you tires are inflated properly. Other things you can do is reduce the weight as much as you can by making sure you aren't carrying maximum water unless you really need it and making sure your black/grey tanks are empty.
As you can see from my signature, I also added 19.5s, extended bump stops, and Rancho Adjustables.