Transporting, loading, and unloading kayaks, canoes, and bikes is a breeze with Adjustable SPACE Bars. These bars are compatible with most rooftop rack accessories, making them a versatile and convenient choice for outdoor enthusiasts. Dynamic (moving) Weight Capacity – 225 lbs. (Gear being hauled on the bars in motion – bikes, kayaks, canoe, folded up roof top tent) Static (not moving) Weight Capacity – 600 lbs (Total weight the SPACE bars can support safely in a stationary position which includes the tent and occupants.) Trailer needs to be equipped with heavy duty gas cylinders and rear stabilizing jacks. SPACE Bars are not adjustable in height. The SPACE bars measure at 1.125 clamps diameters. The 72" SPACE Bars are designed to be approximately parallel with the fenders.