For the life of me, I can't figure out why the Ram's payload is so poor, even with the air suspension. When the 2013s was first talked out, spring of last year, they claimed 3050 lbs payload. Then it went out of the door and was never talked about again.
If you're teeter tottering on the edge, simple tricks are: remove the tailgate, and put the spare in the trailer. Together, that'll free up 150 lbs or more from the rear axle (those weights are behind the rear axle).
Even then, remember that it's the axle weights you gotta really watch for, the GVW is less important as far as the safety and DOT is concerned; it's there more for warranty purposes.