For years I've used a Garvin rack basket on both of my Jeeps. It's worked very well and I've developed the accessories I need to carry the range of items I take with me on expeditions, so I'd like to use the Garvin on top of the Grenadier as well. I've attached a number of photos of the various configurations and uses of the Garvin on both Jeeps, including a custom front basket extension I made with a pull-out solar panel underneath. The extension attaches to the rain gutters because the Cherokee rails I have on my homemade hardtops don't go that far forward on the roof. I want to install the same setup on the Grenadier. Photos of a few configurations of the rack on my Wranglers:
The pull-out solar panel under the rack:


I need three load bars for the Grenadier - two for the main flat area of the roof to hold the Garvin basket, and one bar for the front to hold the front of the extension basket with the solar panel. I came across a person whose Grenadier came with factory rack bars and he decided not to use them, he offered a nice price so I sent him the money and he shipped me the rack. Unfortunately most likely due to an error at the pack & ship place he used and not his fault, I did not receive one of the legs. He offered to make good somehow, so I checked with Rhino and they told me that they don't make the legs - Ineos makes them, so I'd have to go to the dealer. I then called my local dealer (RDS in Devon, PA.) and asked them if replacement parts were available. It turned out that due to some warranty work (I think), they had an extra leg just lying around and they told me I could have it. I jumped in the Grenadier and headed for RDS. While I was there I showed them what I was planning to do and asked if they had enough random parts in their attic to make up the third crossbar I needed so they rummaged around for a bit and came up with almost everything to make up a third bar except for a few hardware bits (mostly bolts I was able to source easily). They sold me the parts for the third crossbar for an extremely reasonable price so now I've got the three crossbars I need.
All of the parts. The legs are in the tote bag.
All 3 bars assembled:
And while I was at the dealer picking up the rack parts, Tim, the sales person who helped my buy my Grenadier, gave me a Grenadier hoodie and the tote bag in one of the photos above.
Big shout out to RDS Grenadier - Tim was very helpful through the buying process, the service department was great resolving one technical problem it had immediately after delivery, and Dave in service was a great help to me in collecting all the parts I need for the rack bars.
I'll post photos when I get everything installed.