I too want to apologize for the amount of post I have, though I have no clue what this has to do with the OP's question about tires for his 5th wheel...
I still recommend Michelin XPS RIPS IF he has 6,000# rated axles....but at this point, we don't know his 5er's GVW, nor do we know what OEM tires he had on it to begin with...
.....oh, sorry for this post, but was actually trying to help the OP's, as were more than several of us in here.....if MOD want's to remove this post, you're more than welcome to so that I don't pick up another one...