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Freestanding truck bed slide

Basically this is a 4' x 8' rolling tray on 2" casters. There are 2 legs at one end that rotate parallel and lock in the downward position with a bolt, and 2 legs that swing out sideways and lock in place with slide bolts.
I can use this to drop my cargo (tools) in under 3 minutes.

YouTube video here: http://youtu.be/hDJoPFME9BQ
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