The Rambox divider will not fit a non Rambox bed. I have a non Rambox Limited and it requires the BUG rails and a second set of rails that come with the divider kit. The divider rails mount above the BUG rails. It’s a ridiculous design but the divider is great. I love how it functions and it’s easily removable to allow full access to the bed. Why FCA didn’t just design the divider to utilize the BUG rails is beyond me buts it is a nice option. I also had the Mopar hard trifold tonneau cover and there was no issue with fit. I got rid of the Mopar hard trifold because it leaked like crazy. I put my Mopar soft cover back on and it works fine with the divider but you have to finagle the rear clamps to get them open. It’s a bit of a pain but you get used to it.
Actually - RAM didn't "design" these. They are OEM'd by "Roll-N-Lock" - a rolling cover manufacturer. No - RamBox divider (that slides down into the "grooves" in the bedwalls) will not work.
Try using them with the Multi-Function-Tailgate.
I had to cut the bed divider rails down, so they would clear the corner brackets on the front of the bed. Despite all the hassles of things that just won't work with the MFT (and waiting a year for the center mounted bed step to ship) - my 5'5" short fat butt finds the barn door tailgate to be one of the main selling points that got me into the RAM.
Also - "most covers" should fit with the bed divider. The ones with a clamp up front - and clamp in the rear (I'm running the Gator Hybrid - again, because it's the only one that fit the MFT at the time) will clear the rails for the divider. Ones that have their own rails that clamp to the bed lip are going to be a little more fun to get installed - might even require removing the bed rails with the divider rails installed - to get the cover rails on.
Yeah - the design is ridiculous - and was done with ZERO CONSIDERATION to anything else you might want to do in the bed. Almost makes me wish I got the MFT AND RamBoxes - even though I don't really care for them, don't need them and don't really like how they look - the difference in the bed with the boxes solves a lot of other "accessory issues" created by the MFT.
Should have just gotten a Suburban and been done with it (I KEED - I KEED) - love my Ram, but some of the things they did in the design just makes me scratch my head in wonderment.
Rick