I just wanted to comment on the highway speed mentioned. I also take my time and run 55-60 on the highway. Most ST rated trailer tires are speed rated to 65mph and exceeding that for any length of time will overheat the tires and they could fail. Lots of damage occurs when that happens.
I run 55-60 with my rig and just stay in the right lane for the most part. I've never had an issue running this way and neither did my dad. The faster you go, the less reaction time you have and the harder it is to stop all that weight.
Be safe. Good luck.
