hey i was looking on the internet today and saw that irok makes a 39.5/13.5/17 radail tire. I heard that the tires look very very skinny, will those radail tires both out last a trxus sts and tsl in the same size. Worth the extra couple hundred on the tires. Also how the iroc do millage ect. Its 90 percent dd and 10 percent fooling around. Need millage.