My suggestion is to email Thor and attach a photo and ask them what they are and where they are supposed to go. You can call them first to get a good email address to send the pics.
Chances are your dealer won't know enough about the rig to tell you what those brackets are.
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054