Given the price, I'm guessing LT 235/85R16. Know nothing about Regul tires, but I replaced Hercules this summer with Bridgestones. The Hercules performed well for the most part except for the last pair I had put on the front. They suffered from premature vertical cracking and had to be replaced at 2 years, while the last set of rears were good for 5 years with NO signs of cracking. Went to the Bridgestones (R250F) as they are now steel side walled tires. Don't have a lot of miles on the Bridgestones but they seem to be more stable on the road than the Hercules were.
