Over weight on steers

13,200 steer axle weight rating. Look at the door jamb, the sticker there. You should be just fine so long as you're not over anywhere else.

EDIT: Nevermind, I read the whole post just now and saw your tire ratings. Sorry, my brain stopped reading it before I replied at "12400 on my steers"

 

Does it have a cattle guard on the front?

If you have an APU you're ok just don't go over on any other axle.

 

What do have for a motor?

 

are you loaded or empty or bobtail?

 

I'm betting once you load the wagon, you'll be under 12 if your 5th wheel is back all the way.

 

did you spec this truck(order), or did you buy it off the lot?
Check the placement of the fifth wheel on the frame, it may be attached to far forward.