I admit to not understanding sway. Since our tow vehicles and trailer weights are similar I'm interested in the post.
The only time I feel anything is when a car carrier passes me. They seem to create more turbulance than a traditional slab side semi. I don't detect sway but I'm aware the car carrier's passing me.
Our trailer is similar in weight
to Deryk's and our tow vehicle is similar in size to his as well. As to sway, we have one of the lightest tongue weights on the site, at least for a 16' trailer, and have towed it for at least 2000 miles with out an anti-sway bar and have never felt any sway.
We do have an anti-sway bar now for the reason Carol stated, 'in case of an emergency of some kind' and in fact have had two of those emergencies in six years of towing.
Our tongue weight
is around 200 lbs, less if we're low on propane
. We always carry a 1/2 tank of water and more if we're going to dry camp. We do have a bumper box, though not heavily loaded.
Deryk has not mentioned his tire pressure. I keep the Honda's rear pressure at 39 psi cold, fronts at 36. Substantially higher than the standard setting. I keep the trailer tires
near maximum, around 48 lbs. I have no air bags or wd hitch.
As to wheelbase, there's two parts to the wheel base equation that count, distance between the axles and distance from the ball to rear axle. A truck may have a longer wheel base but also the distance from the ball to axle may be greater.
As to gripping tighter with both hands, one wants a hand free to be ready to give the brake controller a little tap if sway is occurring; generally a tap on the trailer brakes
will stop it.
The only time we've seen sway is when we attached a generator
to the rear of our first trailer on our very first trip. Moving the generator
off the bumper stopped it.
I'll be interested in seeing how you control the situation.