To make the trailer have a narrower width than the truck, which all research I've done said helps the trailer follow the pull vehicle.
And since you made the oil comment, it means you didn't read what I had posted in response to the last time you mentioned it, which means go be angry little man elsewhere. Seriously, if you don't like me you are free to stop commenting on my threads.
Well since your research shows, no need to listen to my suggestions then....
However, since I'm always helpful, even if you don't choose to consider, believe or accept much of the advice you're given, I'll add that inherently, single axle trailers "wiggle" more than multi axle. Shorter distance between the hitch point and axle, more so than longer distance between. Weight distribution, pickup bed trailers are fairly close to axle centered under load or even closer unless the front is loaded heavier = less stable or worse tracking.
Basically the only thing one could do to make a pickup bed trailer tow worse (not that they don't tow ok if loaded with decent tongue weight or very light loads) is to also make it's track width narrower.
You're from Cheeseland, basically the home state of water-skiing, so here's a good analogy. When you're skiing, you're the trailer, right? Which is more stable? Combo skis or slalom ski? It's 2 skis, wider track width.
Although if there is some merit to narrow track width, I'm always willing to learn, but my engineering degree, basic physics and 30 years of construction work, towing countless different types and sizes of trailers says otherwise.
Oh, and not angry....or little. Cheers!