The Up: This is the most widely used type because it rotates to a horizontal towing position and locks in place parallel to the trailer frame. The wheel makes it easy to move around on a paved surface. It fits tongues up to 3 inches by 5 inches.
The Down: It has a limited weight capacity (1,000 pounds) compared with heavier-duty nonswiveling models. Also, watch the handle so it doesn’t drag in low-profile applications. $60; dutton-lainson.com