I also have the 6'4" bed in my 2500. I decided to go with the Pullrite SuperGlide, which is an autoslider. This is my first 5th wheel, and it works superbly. The unit is the 2315, which is what Pullrite showed on its website as OE Puck compatible for the truck. It's designed for up to 24K trailer, which is overkill for my 9k gross 5th wheel. After I bought it, I saw the install instructions were also for 2700 and 2900 series, which I think either of which might have worked (16K and 20K rated). In retrospect, I should have called Pullrite and spoke to them first before ordering (they are very helpful), and might have saved about 100 lbs of payload weight. The hitch weighs 270 lbs; can't remove it by myself without using a hoist.