Talked with a highly recommended RV/Alignment shop here and other talk forums and they recommended the Michelin XPS RIB®.
They went into detail of how the rib tread is better for mileage , handling and doesn't flex as much as the LTX MS and other tires..
That is all I've ran the LTX MS2 and now the set I had replaced from BFG Commercial to the Michelin Defender.
Not sure what the difference is between the reg LTX MS2 and the Defender tire ? I know the mileage wear warranty is different, the Defender shows 50K while the LTX MS2 has a 70K wear warranty ?
But the tires will age out before that kind of mileage...
Next time to replace the tires , I might try the XPS RIB ..