A question about tires on three axle fifth whl trailers.

Our fiver came with Goodyear G614 tires. Had them for almost 5 seasons. They have done great. Keep them at the prescribed 110 PSI and 115 when storing for the winter. I will be replacing them at the end of this season with the same tire. We hit the scales and the 6 tires on the RV had just a tad bit over 15K lbs. of weight on them. The other 4K lbs. sits on the hitch. The tires do cost $350 a piece, but it is worth it.