Just a quick follow up:
Our original Carlisle Loadstar bias ply tires wore out in less than 2,000 miles. We replaced them with the Kenda 10 ply radial tires. They now have roughly 1,950 miles on the Kenda tires and they are not showing any signs of wear yet. We have been over some terrible roads (as one can imagine :) ) and the tires have heal up very well. We stayed at the small Troncones RV park last night and were very pleased with it. It is a wonderful place :)
Nice, quiet, safe and there and a number of good restaurants nearby as well as the beach. Highly recommended! Thanks John:)