I have the Roadmaster RM160's on my 5er and they have been on for over 4years with no problems, I don't keep track of the miles ,but have over 20,000miles on them could be as high as 30,000, without any problems. I rotate them yearly and watch the air pressures. So the end result is that you shouldn't be afraid of this brand of tire, If you are happy with the price, go for it and don't think anymore about it.
03 Silverado cclb 3500 drw, D/A, Reese 22k hitch
07 Alfa SeeYa Gold 30RL,2 slides,power everything