The ultimate Drawer slide test
This video is a weight test of 50" (Inch) extension Drawer slides, fully loaded up. Lets dig in and see how they actually performed. This video shows you how to install a pair of long stroke (50" - Inch) extension drawer slides that offer a weight capacity of 400-lbs total. In the Video they use a GoKart pull out slide from a trailer for easy access to work on it. He then loaded up the slides with 400 lbs to see if it can actually hold the weight.
The slides used is a pair of Firgelli 50" Extension drawer slides
He shows you how to install them and then load up the slides to see how much weight they can actually carry. Personally using wood 2x4's is not the ideal material to use for carrying 400-lbs weight, we would recommend using metal to connect them to which does not bend or move and will result in a much smoother sliding.
Here you can see these draw slides extended and fully loaded up
The slide is now fully extended and loaded up with weight. Although wood was used here we strongly recommend for high weights such as 400lbs of more for Drawer Slides that you install them into something more sturdy like metal.
Please remember when you want to install draw slides that are going to be loaded up to weights of this magnitude, you really need to mount them to something stronger than wood which can easily deform. We recommend mounting to steel or aluminum for extra rigidity.