I have a 2015 f-150 crew 6.5 box with 3:73 5.0. I pull a 24' enclosed totaling about 8k loaded.
Plenty of pulling power but trucks back end wants to be pushed sideways in turns and never experienced this with my f-350. I am questioning the rear springs since the drop 3+ " and a equalizer hitch does mininimal to the front end height.
Does anyone have a heavy tow package spring part number?

 

Before you buy heavier springs, I would want to make sure that they would solve your issue.
Have you been over a CAT scale (several times) to verify that you do have the WDH set up correctly? How much weight are you transferring back to your steering axle? With my setup on a 7000 TT, I move around 450 lbs onto the front axle, and handing is pretty decent that way.

The other factor is that your F150 will get pushed around more than your F350 because of the lower curb weight. That's nothing to do with the rear spring stiffness.

New springs, or air bags may help, but I'd hate for you to spend that money and still be unhappy with the result.

 

You may want to look at your tires. My truck came with Good Year Wrangler SRAs. Those tires are very nice riding but leave something to be desired when the truck is loaded up.
I up-graded to GoodYear Wrangler Adventurer with Kevlar (still P tires) and a set of Bilstein HD shocks. It makes a big difference.

 

Anyone doing heavy towing would do well with LT tires. Even Load Range C is much stiffer than P rate tires.

 

Thanks for the input. I have moved weight forward with the hitch and had to go down one since it felt like hitting a curb. Tires are my second guess thinking of sidewall, at a higher psi it seemed worse. Air bags are my next thought but might have to keep the 6.0 since I can't shuffle the weight much.

 

I don't understand what you mean. Can you explain this a little more? If you have your scale tickets from the various setups, post those for us if you could.

 

How would I do this on a scale? I understand how to weigh the truck and trailer individually and combined and also determining tongue weight but not how to measure front of truck, unless by only front of truck on scale with and without WDH setup.
distribution of the cargo (position of the two UTVs) is very limited due to length of trailer too.

 

Find your local CAT scale, they will weight steer and drive axles (front and back of truck) as well as your trailer, all separate.

You need to make a few passes to get all your info.
1) truck with no trailer
2) truck with trailer and WDH disengaged
3) Truck and trailer with WDH engaged
3a, 3b, 3c etc) adjust WDH until you are happy with the amount of weight you are shifting.

It's not a fast process, but it's not terribly complicated either.

 

I've been looking into Super Springs for the back of my truck. They should keep the rear from squatting so bad...

 

We've used super springs on our last two Tacomas. They work great.

 

I should add that the 2012 Tacoma has a rack-it lumber rack, plus a shell, plus a bed-slide. That's around 800 lbs of load before we add the gear/equipment. So it's pretty much loaded all the time. The super springs were a necessity.