I did 11,000 miles last year. The tires were Goodyear Wranglers size LT215/75-15. If you have room to go larger, I would do it. There are no great tires available, in my opinion, in your current size.
My new Chinese wheel bearings were spent and ready to completely fail in those miles. I replaced with made in USA Timken bearings.
The trailers made today are not ready for prime time, to make them reliable you have a lot of upgrades to do.