@EB12 , I just went through this. I installed the Pioneer Platform on my Jeep and one of the FSR Hardshell Power top tents.
My issue was that the Pioneer slats run the length of the top(front to back, vs. side to side) and the mounting rails on the FSR also run front to back, but they do not line up in a way to where you could actually mount them to the rack. I had to get fairly creative, but I don't believe you'll have that issue.
I'm fairly certain that you can install the mounting rails on the bottom of the Smittybilt in either a front to back, or a side to side fashion, because I don't think they're pre-installed(my Tepui's were not-have a Tepui on my trailer). If you can, mount your rails front to back, and measure them to where they are wide enough to fall over the rails that run side to side on the Pioneer Platform. You'll then be able to run your included brackets and mounting hardware over top of the Pionner rails and secure from the bottom like normal. Yes, it's tight between the Platform and the roof, but it can be done.
It's kind of hard to explain exactly what I'm referring to, and if you haven't installed this yet and have some questions, feel free to message me and I'll send you my cell number. More than happy to show you what I did on mine and offer some tips on yours, if you need it.
