Too new to be widely available. eTrailer.com has them, but they don't include them as available for a Ram with 6' bed.
Also note the effectiveness. The Hijacker slider will slide 14". The SuperGlide will slide over 20". That's a huge difference that could be the difference in a crunched cab or a nice jackknife turn.
Suggestion: regardless of which one you decide on, be sure to order the new Ram with the optional 5er/gooseneck install kit with under-bed rails. That's dirt cheap when you order it as an option, but very expensive if you later decide to install it yourself or pay someone to install it for you. Both automatic sliders can be ordered to plug into above-bed "industry standard" bed rails (i.e., Reese bed rails), but then you have the bed rails in the bed all the time. With the factory prep kit option, you have clean uncluttered bed when you remove the hitch.
Grumpy ole man with over 50 years towing experience. Now my heaviest trailer is a 7,000-pound enclosed cargo trailer, RV is a 5,600 pound Skyline Nomad Joey 196S, and my tow vehicle is a 2012 F-150 EcoBoost SuperCrew.