The difference between a HighRider and LowRider is how the axle is mounted to the leaf spring. The springs are mounted above the axle on a HighRider whereas the springs are mounted below (or underneath) the axle on a LowRider. Refer to the height of your hitch and the height of the trailer tongue to determine which trailer is best for you. The trailer tongue should be as level as possible when attached to your vehicle. See Chart diagram here