The Trail Series by RCV axles are designed and engineered to handle the most abusive conditions on the trail. From mud to hills to rockcrawling. With years of experience in and working with the top drivers in the industry, we have been able to develop the ultimate trail axle solution. The Trail Series axles feature our own high-performance grease, designed to withstand the harshest environments. The heavy-duty CV boots resist puncture and abrasion more than any OEM boot. Using American 4340 steel and manufactured in the USA ensures quality and durability.