Simular to a truck bed slide, I would like to use 80/20 and build it to my custom length and width. 90% of the bed would be sticking out of the truck. The bed length would be about 6 feet long. I want it to handle 500-700 bls. So the bearings would be able to handle 5ftx700bls = 3500 bls/2 which is 1,500 bls each? bearing on each side? Not sure if this is the right math.
here is how it would look
http://www.pickupspecialties.com/Bed...bed_slide.html
Thanks!