I know that towing questions have been talked about many time but could I get some input on my numbers.

Info 2014 FX4 Ecoboost,crew cab,short bed, Max tow and payload package.
Truck wt 6400lbs loaded with fuel and with 200lbs of gear.
Combined gross wt with truck and boat and trailer is 16,140lbs.
Weight break down when weighing at a truck stop.
Gross wt 16,140
front axle 2740
Rear axle/drive axle 5200
trailer axle wt 8200

My question is do I have 2000lbs of tongue wt. because the difference between the rear axle with no trailer is 3060lbs and when the trailer is hooked up my rear axle is 5200lbs. It just can't be possible that I have that much tongue wt with a a boat and trailer that only weigh 9740lbs. One other thing that might help is there was a good amount of sag when I hooked up. I did have Timben bump stop installed to help any sag, but there was still a good amount of sag. Distance between axle an Timbrens is about 3/4" I should of looked to see how much the Timbrens were compressed.

Any imput would be greatly appreciated.

 

It's very possible, depending on how far back the trailer axle is. It's quite apparent from your scale numbers that the front axle is having weight taken off of it, and quite a bit, which a heavy bumper-pull load would do. My buddy was having the same issue on his Tacoma, turns out the axle on his boat trailer was bolted to the frame and he was able to unbolt and move it forward to improve weight distribution.

 

ok ... so at first glance i'm thinking "no way is there that much tongue weight on an 8200 lb boat"

but here's some numbers for you:

with a wheel base of 144.5, and a rear overhang of 52.3 (to the center of the ball), every 100lbs of tongue weight transfers 36lbs from the front axle to the rear axle. so, the front gets lighter and the rear gets the weight of the ball plus the amount of weight taken off the front axle.

so .... based off of your rear axle is getting 2140 lbs heavier, that would indicate 1573 lbs of tongue weight ... but there's more to the story.

ANY weight placed in the bed behind the rear axle will also transfer weight from the front axle to the rear axle. you mentioned an addtional 200 lbs of cargo, but you didn't say where. if it is behind the rear axle, some of the weight gain in the rear is from that. ... but wait, there's more

you indicated 2740 on the front axle when loaded. my best research shows the empty weight of a Screw 4x4 144.5" WB truck is 3206 (from hiller ford's data). so, from this we know that roughly 466 lbs is being transfered from the front axle to the rear. remembering 36 lbs per 100, gets you an estimated tongue weight of about 1280 lbs.

so, it seems reasonable to assume that you have somewhere between 1200 and 1500 lbs of tongue weight on that boat (which is a LOT)

now these are all educated guesses.

the BEST way to know, is to weigh the truck fully loaded but without the boat hooked up, then hook up and weigh the truck hooked up. the difference between the empty and loaded weight is the tongue weight of the trailer.

once you know the tongue weight, (from empty vs loaded wieght of the truck), then you can add that number to the axle weight on the trailer to get the total weight of the boat and the trailer.

guestimating on the heavy side at 1500lbs tongue weight, and 8200 on the axle, your boat probably weighs about 9800 lbs. So, You've probably got more tongue weight than you need. If the axles of the trailer can handle few hundred more pounds, you could probably skootch your boat back a bit to take some weight off the truck. 10% is a good target with a boat. Some say that you can go as low as 7% with a boat because the wind load does not unload the tongue quite as much as it would with a flat nose trailer.

with that much tongue weight, you should really have a weight distributing hitch -- even if you get it down around 10%, you still should have one. I assume, with that size boat, you also have trailer brakes - likely hydraulic surge, which makes finding a weight distributing hitch harder. There are a few out there that work with surge brakes, though.

here's a few:
Surge Brake Compatible Weight Distribution | etrailer.com

i would shoot for about 10% tongue weight, and get a good weight distributing hitch that works for that amount of tongue weight. your towing experience would likely be much more enjoyable.

also of note, you are overloading the crap out of your hitch. I'd get under the truck with a torque wrench and make sure the hitch bolts have not stretched and come loose. if you find any loose nuts, replace the all the fasteners (bolts and nuts) with new ones, simply retightening them is not a proper fix. they may be fine, but i'd check them.