A little uncomfortable with my set up...

Let me be clear, it is not that the trailer sways behind the truck, more or less that the whole unit (truck and trailer) combined move around together. The connection between the 2 is solid. I feel the trailer simply pushes the truck itself around, it doesn't sway behind the truck. I have a good HD-WD system and 2 friction bars, not the most expensive set up, but I can't see that throwing $2000+ on a different WD system would fix the problem. I am thinking the extreme height and length is catching the wind and will just continue to push the truck around no matter what the WD set up. It gets worse on high open bridges, pushing both vehicles around, but at least in unison.

Never thought about the tires, they do look like generic no names.