Thanks for the advice! My tires are 15" Goodyear tires. My camper is a 2018 and barely used. The sidewalls of the tires look very sound. When inflated to 40psi they were getting pretty hot, which got me checking the pressure.
I didn't realize the rating on the tire is for that one tire, and not the whole camper weight
Since I live in Mass, I haven't been able to get to the Smart Weigh locations yet. Didn't realize I could get more than just the weight
of the whole TV and camper at a truck weighing
station-- will do that ASAP and see about distributing the weight
My hitch does have the right rise to keep the tongue level, so that's not the problem. And I never would drive more than 65mph while towing. But having to keep below 57 wasn't so comfortable on the highway with everyone else wanting to go much faster.
I do have a sway bar and will learn how to use it but agree it's best to correct the problem and just use the sway bar for those unexpected emergencies.