When you install them, make sure to add something to hold them against the ramp when folded so they cannot swing forward if you slam on the brakes.... I've seen solutions ranging from bungee cords to clasps.
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Dual Extension Ramps
Ramps are fabricated from sturdy .125 aluminum with tig-welded reinforcing ribs and a steel plated heavy hinge and rivets. Easily flips up for transportation. 14" Wide & 72" Long. Sold in pairs.
Price: $269.99