Boy do I appreciate your response. I only have 1500 miles of worry free towing (since Carlisles replaced my blowmax). Your 15,000 has given me more confidence. Are yours 12 ply? My tire guy recommended replacement after 3-5 years, but then he sells tires.
Mine are load range F and according to the sidewall they are not 12 ply. I don't recall discussion with him on # of ply. Told him my application, size and load range. The Blowmax were Load Range E.
I think the OEM tires are barely suited for the trailer unloaded. If you were going to buy it, haul from the dealer to your seasonal lot and then put stuff in it, probably not an issue. If you use the thing like most of us here, dragging the trailer around loaded up with your stuff, then the [towmax] are not up to the task.