I actually checked the bolts several times on the trip and everything was tight.
My trucks payload capacity is 1928lbs. My family is young, so even with my fat butt we only total 600lbs. The listed hitch weight for the trailer is around 850 lbs, leaving me 500lbs to spare on payload capacity and 150lbs on the hitch spring arm capacity. I know the real numbers will be different, but I would be surprised if I exceeded those guidelines.
And I have to go back to.... My set up was working. I am very careful to not significantly change my payload between trips and keep things as balanced as possible. And nothing changed in my payload between the first and third days of the trip. Even through the downhill portions in the mountains of West Virginia I had no concerns. It was not until the straight highways of Georgia on day three that I started to have sway concerns.