I have a Heartland Sundance that came with Towmax. I made 4 campouts, about 200 miles, and noticed a tire seperating. The Heartland forum has 100's of Towmax tire complaints of blowouts and tread seperation. They are junk !
I bought 4 new Maxxis and have not had any problems since. I did a lot of research and Maxxis has the best reputation for ST tires on the market.
I found that Carlisle and Goodyear Marathons also have terrible reviews. The Goodyear G614 tires have good reviews but cost a small fortune.
I dont know anything about the Geo Star, but I would do my homework before purchasing. You dont want to end up in the same boat your already in.
Walter and Janie Rogers
2012 Sundance 277RL
TV 2006 Silverado 2500 6.0