I used the factory rails, but I only used it like a dozen times and was looking at the Rocky Road outfitters rails as I don't think the factory rails would last very long. I have heard good things about the Rock lizard rails, but they were in a transition phase when I was looking. As far as handling, I could tell it was up there but it wasn't too bad. I usually put it into Full time 4wd (ie AWD) and it felt like normal. I did lose ~2mpg on the highway. Moved to a J30 because I couldn't fit into the garage with the RTT.