I used my bed for the first time and put 4000 pounds of rock in there and she still drove good! I love this truck the over head reading read 16.5 mpg all the way home!!!!!!!!!!!!!!

 

That's a Lot of rock for the truck. Not that it can't handle it, but you are over loaded. The 2500's are only rated for 9,000lbs gross, so 1 ton of stone is about all you "should" carry. 4,000lbs is a lot of weight. (not to mention any fines you could get)

2nd, if you even think about calculating your millage off your overhead, put a piece of tape over it, it's about as accurate as a math teacher in the dark. Those things are normally 2-3mpg off, so hand calculations are the only way to check.

Other than that, these things do great pulling, towing, ect.

 

I was at 11,700 in my '03 shortbed, same load, dirt and rock. When I hit the scale I just got a look of amazement from the girl in the booth.

 

I'm regularly at 17k when leaving the pit...

 

Curious as to how much sag you had.

 

And your front tires are still on the ground?

 

My truck weighs 8820 empty.

 

You could tellI had a load she sag but not as much as I thought it would!

 

4500# in my stock 2500 and still drove pretty good considering. It was a little squooshy in the turns.