6 years on LT265/75R16s... no problems.

me2 wrote:
I put cheap generic LT265/75R16 LREs on our Chaparral 355 6 seasons ago after one of the Goodyear Marathon ST230/80R16 LRDs that came with the trailer developed a bulge.

I have not had a single problem with running LT tires on this trailer and they get abused regularly. We pull it about 2500 miles a year. The tires look like new. I do not cover them in winter.

Our trailer weighed 10,750 lbs dry when new. I've added a lot of equipment to it. On our last trip the trailer axles weighed 12,100 pounds alone. Before the weight police get up in arms, I replaced the stock axles with 7,000 pound torsion axles with hydraulic disk brakes. It handles beautifully.

Our trailer sits a tad high in the front when hitched to the truck. I suspect the rear tires are carrying a bit more load than the fronts. I haven't weighed the individual wheels.

I think LT tires are 10x better than STs.

I have had a lot of tire blowouts using E rated tires (Marathons). I replaced the E rated tires with Goodyear G614 G rated tires on the 6,000 pound axles. 235/85/16. They worked good, and I think that the G614 tires are great (we have a heavy 5th wheel).
I then found out that my Cedar Creek springs failed. Flatted out. I had the 6,000 pound axles replaced with 7,000 pound axles. New brakes, new tires, new springs. The manufacture put on ST tires, G rated. I had to give up the Goodyear G614. From now on, The Cedar Creek people will not put on LT tires on the new trailers. ST only.