When it starts swaying
The best response it to give it more gas and drag the trailer brakes
Do NOT touch your brake pedal or move the steering wheel until the swaying stops
do NOT try to compensate with the steering wheel , you will just make it worse
Just mash the gas , let it sway and drag the trailer brakes until it stops
And if you give it gas and drag the trailer brakes , the swaying WILL stop , then keep dragging the trailer brakes and take your foot off the gas and pull over and fix the problem
Swaying means you don’t have enough weight on the tongue
I’ve towed some trailers that had air compressors and stuff mounted inside and it swayed so bad you could get over 40
I stopped and bought a 55 gallon drum
Strapped it in the nose of the trailer and filled it with water
That cured the sway
Towing more than 5000 lbs with a shortbed 1/2 ton 50 yr old pickup is just stupid
Not something you want to brag about
I’d say You can tow about 5000 if you have the right weight on the tongue and a weight distribution hitch and maybe a sway control bar
Good brakes on the trailer
A good quality brake controller In the cab
And use some common sense and don’t get over 60-65 tops
And keep a safe following distance from the cars in front of you
You will get passed by every other vehicle on the road
You’re not in a crew cab turbo diesel F-250 that is six feet more wheelbase , weighs 3000 more lbs , has twice the braking capacity, and four times the power