I ran full length square drivelines in mine, they did occasionally make contact with a rock or two. The beauty of the square drivelines is that they are as tough as the rocks. Some may recall an incident where I repeatedly tried to make a climb in Tucson bringing the full weight of the rig down on the driveshaft over and over. Driveshaft had a slight bend. From time to time it was also nice to put the driveline on a rock intentionally and walk the rig over. Obviously the speed limitations are the downfall of the squares. If you decide to go that route I still have three of them I am tripping over on the garage floor, one has a slight bend.
El Destructo! I void warranty's!!!
Team Rock Limo
Yukon gear/Randy's Ring & Pinion, Trail Gear, BFGoodrich Tires, RuffStuff, 12 Volt Guy