i have a 25+5 tandem duall gooseneck and haul a 8000lb ford on it, behind my ext cab sb dmax, and have a resse rail kit and gooseneck plate for it and I have airbags with about 20 psi in them seems to be best, but on country and rough sections of road the trailer wants to sway some, any ideas? tires are e range 265/75/16 mastercraft courser ct's ive always towed with a dually before and this is first srw

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Have you tried loading the truck further back on the trailer ? What pressure are you running in the trailer tires. ?? Finally...towing with a dually is more stable than a single axle so you may have to just slow a little.

farther back equals more sway, trailer tires about 70psi trailer deck is a lil elevated in front so thinking that is the reason maybee

That was the only thing I could think of was more weight on the tongue. It looks like you have the truck forward as far as you can. If you can level it that might help.

I agree with more tongue weight and check all your tire pressures. Check the trailer suspension too, be sure everything is tight and there are no stress cracks or broken springs. If everything looks good then slow down a little.

A Reese rail kit with a gooseneck adapter leaves the ball several inches behind the location of a B and W. Too far back IMHO.

The ball should be about 5-6" in front of rear axle. It's kinda hard with a short bed but at least it should be over axle or a hair in front.

what brand of trailer is it? PJ Trailers are great... and Friesen Trailers are good too.

the resse rail kit was in truck when purchased, i want a bw but dont see a need of wasting money, trailer tracks behind my ford dually flatbed i have

For me on the "old" truck (1996 F-350 single rear wheel 4wd) it was the flex in my rear tires walls (even when fully inflated to 80 lbs) and 15 inch D rated tires on the trailer that caused the sway. Fixed it with Michelin 10 ply on the rear of the truck and 16" 10 ply on the trailer. (it was a travel trailer, not a goose neck).