I am certainly no expert, but from my experience I found that lowered the pressure a little did smooth out the ride. Our TD weights 580. We had 200 lbs of gear in it. The trailer is rated to 990lbs. We lowered the air pressure 10 psi under max. It reduced the bounce. I thought of doing more, but I didnt want to chance it.
I know that my TD can "Get two feet of Air" when you hit a 10" frost heave at 60mph. The car missed it, TD didnt. I said, "Who put that basketball under the pavement?"
I am not saying I went over the speed limit, but I know the TD pulls well up to 83 mph. I did drive for hours at the posted limit of 75. Well above the recomended limit of many trailers. Mostly we traveled at 65mph or 35 mph. It just worked out that way.
Our tires and hubs never got hot. I checked every two hours.
I was told once to keep in mind that many of the trailers we use for TDs are used everyday in construction and farming in situations we might never attempt to go with a TD and they work fine. Be safe and experiment carefully and you'll find out what works well for you.
11,000 miles+ TD (original tires). So far this year. -Ray & Debby