I honestly don't think a sticky would be all that beneficial for a rock bouncer going fast. I find that some of my best traction is at an idle. Sitting on a hill and smoking the tires would burn them up in no time. I'm also not sure that in a bias 42-43" tire that there is much of a difference as long as they are a big lug tire.
GLFWDA member since 1979.
Member Southern Michigan Rock Crawlers.