As I understand it, there are basically 3 versions depending upon whether you have Morryde suspension or anything else. In my case, I have the Lippert Road Armor with a blue equalizer. According to what I was told I need the UO21-003 X Factor
https://www.amazon.com/dp/B007HRXZT2...v_ov_lig_dp_it
which is supposed to work with any system that is not Morryde specific. There is a Morryde specific version if you have any of their equalizer kits like the LRE, TRE, etc. Then there is also a 3rd version which is only used if you have the Correct Track system installed. According to Lippert, you can't get this aftermarket anymore, so you would only have it if your rig came from the factory with it. Since your rig is a 2018 model, I'm guessing you have the Lippert suspension like mine. Maybe even the Road Armor suspension. See photo. You can see the blue equalizer in the pic. There is also the same option with a yellow equalizer, which as I understand from Lippert is the same thing, but yellow indicates "aftermarket" where the blue is factory installed. The second pic shows the options from the Morryde website.