It took me awhile to figure it out, but when the cooler is sitting flat the wheels are actually not supporting it. That's why it is hard to move. Lifting the other end of the cooler sets the wheels back down. :) You probably figured that out later, but thought I'd mention it for others. Also, I built a ventilated fence of sorts to set around mine that keeps things in the cargo area from getting up against the fans. It also keeps my battery backup in place.

They also have a 31 L drawer version which you can put in the trunk easily, and open it without needing to move it. That's the one we're probably going to get if we do (though we'd have to figure out getting it to Canada since that's not one of the models that they ship to us). Even the top opening 30 L one without wheels, which is shorter than yours at 16.2" needs to be moved deeper into the trunk to close the trunk, and closer to the opening to open the cooler. Of course, in the trunk you need to get power to it from somewhere, and the drawer version doesn't have a place to slot a battery into (though you can of course plug it into one). In early versions of the 2023 Ioniq 6 manual, it listed a 12V socket in the trunk (Were you early enough to get it included?), but other 2023 Ioniq 6 owners, and my mother with a 2024 Ioniq 6 Ultimate don't have one. So we either need to put a battery in the trunk or run a cable to it from one of the sockets inside the passenger compartment. I haven't checked how difficult that is. I know we could just slip one between the seats, but I worry about friction and vibration eventually rubbing a hole in the wire insulation.

How did you change the strip under the doors and in the back of the ioniq 6 from silver to black with that orange line? It looks really great!