2 sway bars on a pull behind trailer

I should have mentioned I have a 2018 Chevy 2500hd duromax. The sway problem didn't just start with this truck. I've been pulling the trailer since 96 when new. I think the tongue weight is 800 lbs. I always have put max pressure (80 lb) in all 8 tires on the truck and trailer and that does help a lot. The last time I pulled (a couple weeks ago) I did tighten the pressure on the sway bar (tighter) and that did help and took a lot of sway out of it. It don't go back and forth while just driving, but wiggles a little when big rigs pass and some other vehicles. My trailer weighs 8500 empty. I know tongue weight is important. The reason I'm thinking 2 bars would be better is after tightening the one sway bar did help quite a bit and now seems to be more stable, I assume 2 bars would would be even better. It would put even pressure on each side of the tongue and not excessive pressure on just one side. Maybe the whole problem is I just didn't have enough swaybar pressure all along. When it sways or wiggles it makes for a white knuckle drive.