We do a lot to tow successfully, some small and other large. Hopefully they contribute to a safe tow.
We towed a Scamp
16 for 2000 miles with the lowest tongue weight on the forum and never experienced sway. After that we added an anti-sway bar because we felt it was prudent, but not because we had experienced sway.
We had another non fiberglass trailer where we put a heavy load on the rear bumper and immediately had sway. That was enough to convince me that sway was not something I ever wanted to see again. Moving that heavy rearward load solved the sway problem. I am convinced that balancing a heavy rearward load with a heavy forward load is not a satisfactory solution.
We learned, as many lessons show, to keep the heavy items near or over the axle. Our pots and pans, dishes, water heater, stove, fridge
, can pantry and air conditioner are all near or over the axle. Our clothes, bedding and other fluff items are at the ends of the trailer.
I'm also avoid heavy roof items, one reason I don't like a roof top air conditioner, to me weight belongs low.
Besides having a well balanced trailer, I boost tire pressures on the tow vehicle to stiffen tire sidewalls. In addition I have shortened the ball's distance to the rear axle to a minimum. This helps compensate for a relatively short wheelbase of our tow vehicle, though something that makes sense for any towing situation. I accomplished this by drilling a new hole in the ball's coupling shaft and sliding the coupling shaft further forward towards the front of tow vehicle. This also reduces the see-saw effect of tongue weight on the front axle.
We occasionally fill the trailer's rearward water tank when going into boondock situation, though I've never measured it, I'm sure it further lightens our tongue. In this conditions we restrict ourselves to short distances and slower speeds.
We follow some similar measures with our tow vehicle, keeping heavy weights between the axles.
Additionally we have replaced the trailer's heavy cabinet doors and pressboard table with lighter materials.
Hope this provides some benefit.