We have 75 mph speed limits in OK and I fully intend to drive the speed limits as long as the trailer is pulling solidly straight.
I would highly advise you to research the tires' speed and load ratings as per the manufacturer of the tires.
I have been trailering my race/show car for years now and I can tell you from personal experience as well as talking with others that heat is the enemy - and is generated by speed, tire pressure, and loading.
Almost everyone who starts trailering their cars and buys a new trailer learns two things immediately - the stock tires they sell with the trailers are junk, and, you need to slow down and take it easy ... get there an hour later but you're not abusing your gear or endangering you or someone else on the road.
If I was in this situation, I would be looking for the best tire/wheel made that will fit on axle and go with the biggest diameter you can fit - bigger diameter = greater circumference = less revolutions per mile = less heat