Don't know anything about their track record with large size tires, but they have been around quite awhile awhile. They market private label tires, i.e. have a tire factory build tires for them with their brand name on the sidewall.
Have you read the comany info on their website?
Hercules Tire & Rubber Company
How do their prices compare to Bridgestone, Continental, Yokahoma, Toyo, etc.? These top name brands are usually priced well below Michelin or Goodyear RV tires and you get the comfort of a nationally recognized brand name and dealers most everywhere if there should be a problem.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL