The TPE liner is very difficult at best to get to to stay in the bed at HIGH speed. Rubber mats are heavy and need to retention. Drop In plastic are retrain under bed rails.
Those TPE tray types come with all kind of contraptions to retain them.... like gluing snap in buttons to the...
About the Trac Lok M-4204-M
I set out to install and never found the details other than 'Thin the Clips or Cut Gears or Grind the Pin' yet Yukon sells it already modified as does a shop out East.
Here is the How To ... assuming machining skills, tools and axle assembly knowledge...