Hankooks are great! Have them on my two cars. The original Michelin's on the DW's Odyssey wore terribly, the ride was harsh and the road noise was loud. All that went away with the Hankooks.
On my 32'6" 2015 Class C the Michelin's were cracking badly. I chose the Kumho Crugen HT51 121/120C. Again, the ride and road noise are greatly improved over the Michelin's. Plus I like the weight cushion the additional load rating gives. I don't have to run 80psi in the rears which is max for the rims anyway.
Oh, and here's something to think about if you haven't changed your tires or haven't looked for yourself... When my tire guy was changing mine he said the inner duals had date codes in '09 !!! The outer, more visible ones were in '14.
I think the dealer where I bought the RV, who also does rentals, may have done a swap.
2015 Holiday Rambler Augusta 31M, Ford E-450 Chassis