They usually call it road hazard insurance and it promises to repair or replace the tire.
If the tire is damaged in a collision or a fire, your regular motorhome collision or comprehensive insurance covers it, but normal wear & tear and road hazards are almost always excluded. This some people buy separate road hazard insurance. It is sold by tire dealers, RV dealers, and extended warranty companies.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC