By the time you hung all the added weight on a 300, ie roadbook holder, nav equipment, large fuel tanks etc, the poor thing would really be wheezing by the time you got to the dunes. And an XC would be a poor choice as well. EXC would be the way to go. I'm one tooth up on the CS sprocket on my XC and it's all done at 75mph.
Lost Coyotes MC