2011 Ford V8/5.0 TT Package 3.73 31ft Cougar lite 7800 max

baitboy wrote:
The axle ratio is 3.73 and the GCWR is 15100 lbs. and ( based on waltah's imput) I have gone to a trailer one size smaller same length but weights 5520 with a 1608 carrying capacity.

It's not the truck's pulling capacity that will determine how much trailer weight can be handled -- it's the truck's carrying capacity.

Your yellow sticker says the truck can carry 1412# in occupants and cargo.
The cargo weight should include about 80# for a weight distributing hitch.
You have used a value of 600# for occupants and cargo. That should be increased to 680#.

The remaining "payload" capacity for vertical load imposed by the TT is 1412-680 = about 730#.
That means, when using a WDH, the tongue weight can be 730/0.8 = about 900#.
The corresponding maximum allowable TT weight would be 900/0.13 = about 6900#.

The Gross Combination Weight is equal to the weight of the loaded TV (including weight of the WDH) plus weight of the loaded TT.
Weight of the loaded TV is estimated at (7200-1412)+680 = about 6470#.
Weight of the loaded TT is assumed to be 6900#.
The GCW is about 6470+6900 = 13,370# -- about 1700# below its GCWR 0f 15,100#.

Ron