I looked at one of those when I got my new RAM 2500...much to high for this old codger to jump up into the bed any more...
Decided I didn't want anything attached to the inside of the tail gate or side wall and I went with AMP Research Bedstep and their Bedstep 2 for the sides. Much easier, doesn't get in the way of anything, tucks up under the bed and this old guy can step right on up into the truck or stand on the ones on the side (Bedstep 2) and reach the hitch or cargo with ease.
BEDSTEP® | AMP Research®
Just another "option" for getting "a leg up".
Don & Bronwyn + 1 Cat; J-Lo
2014 Thor Tuscany 40RX (AKA, "The Cat House")
2015 Jeep Cherokee Trailhawk Towed