Even though I haven't had Sumitomos on a motorhome, I'm a big fan of Sumitomo in general ...along with the two other big Japan-based tire manufacturers, Toyo and Yokohama.
The Sumitomo conglomerate is a huge Japanese company and its roots can be traced back for centuries (over 400 years) ...from what I remember reading, it originated the 1600s as a bookshop. Sumitomo himself was a Buddhist monk. But the "modern" company has been around since the early 1900s, still for over a century.
The Sumitomo ST718 is an excellent tire and has very good reviews if researching them online ...and here on iRV2 as there are quite a few threads and posts here with generally excellent reviews ...
go HERE for Google search results for the ST718 on iRV2.
Many of the Sumitomo commercial truck tires are now being made at their U.S. subsidiary just outside of Buffalo NY. I'm not sure if the ST718 is being manufactured there yet or not but from what I hear, they are slowly shifting more of their commercial truck tire manufacturing to the Tonawanda New York plant. Originally, the ST718 were being made in Japan --a good thing.
That looks like a good price that you have in your link. That size also comes in a load range G with a 14-ply rating but if the OEM ones you're replacing are load range F, then the ones in your link should be adequate.
eta: ...the usual cautionary advice applies so be sure to contact Tire Deals Xpress to discuss the requirement of getting tires with recent date codes. I'm not sure but I believe they operate out of Michigan.
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