Tow Vehicle Feel

[RobWNY]

I'm new to towing anything this heavy so I have nothing to compare my experience to so I thought some of you could give me some information. While driving down the highway at speeds ranging from 40MPH to 60MPH, sometimes things would feel just fine and other times, the truck would feel like it's wandering a bit left or right and much of the time it felt like I was rocking left and right. A little like the feel you would get on a boat in small waves but just not that drastic. It also felt like the trailer was in control of the truck somewhat if that makes any sense at all. I didn't feel any push or pull and the truck pulled the trailer fine and stopped it fine, but when driving it was worrisome. This occurs without anything passing me and with very light and variable winds of no more than 10MPH. A typical light breeze. I know some will say I don't have enough truck or my trailer is too heavy and that may be the case but there isn't anything I can do about that now. What I want to know is the causes of this situation. Why it happens or is it a fairly normal experience when towing something this heavy?

Here is my setup 2014 Heartland Trail Runner. 6500 dry weight, 7500 loaded. 2012 F150 Ecoboost regular tow package. Husky WDH and Husky Anti-Sway bar Set up at the dealer. It has the Goodyear Wrangler standard P rated tires. Inflated to 39 pounds. Can inflate to 44psi max. Only payload was me and my wife. No extra cargo in the truck.

Granted, the truck weighs about 5,500 pounds and I'm towing 7,500 pounds so I'm going to know it's behind me. I believe regardless of what tow vehicle you have you're going to know you're towing something really heavy so I'd like some answers that will explain what I'm experiencing and why. Thank you!

[Francesca_Knowl]

Sounds like "sway", often caused by too little weight ahead of the trailer center of gravity, usually the axles. Have you ever weighed the combo? Tongue weight before the addition of W/D should be from 10-15% for stable tow.

Also:

If tongue weight as measured before w/d is correct, the problem may be floating front end. In that case it may be that the w/d itself needs adjustment to restore a little more weight to the front axle of the truck.

[Turbo_Diesel_Du]

Need one more link on your chain and load range E on your tires. P's side walls are too soft. I have same truck in the SC 2013 4X4 and my TT is FR 831 Classic about the same weight, maybe a smidge heavier. I'm also adding heavier shocks and a set of overloads.