What is the F-150's maximum?
 

I am going to buy the Hellwig LP-25's helpers which should raise my carrying capability but up to what tonnage would another part be the weak link? The 4x4's has a 500lb more GVWR and I think the 4x2's uses the same axle bearings and other stuff so I am assuming with the LP-25's I could increase the patload by 500 lbs. Is my assumption correct? I don't plan on carrying more than 6500 lb GVWR (this is the rating for 4x4's, my 4x2 has 6K GVWR).

Leo dC