Both are a commercial grade all steel ply carcass tire and both are recommended for trailer use by Michelin and Bridgestone through emails....1-800 and their dealers. Both are the holy grail of LT E tires especially all type of trailers including rv trailer so you can't go wrong with either. Tirerack.com shows the LT E XPS Ribs at 266 bucks vs 213 bucks for the R-250