Are your tires "E" or "G" rated tires?, (ie, 6,000# or 7,000# rated axles on your rv). If "E" rated and the weight range covers your axle weight rating, the Michelin XPS RIBS are a very good tire, along several others...IF a "G" rated tire, the GY G614 is a good tire, but quite expensive. Sailun makes a G rated tire that is more affordable in the "G" weight range IF that is what your unit requires.
....but again, need to know what your axle ratings are or what weight range tires are recommended for your rv.