Thanks to Septu, I did a bunch more research last night. But nothing conclusive came of it. Actually as is typical of the interweb, it's pretty conflicting.
According to Teraflex, the right rear end cap is "reinforced" by Jeep, but the reinforcement they show in the video doesn't look extensive enough to hang a lot of weight off of. In camping/overlanding the tailgate is open a lot of the time. All of that is supported on the right rear end cap of the tub with the tailgate open.
So figure the weight of the tailgate, the hinge assembly, and then everything that is mounted (Tire, gas cans, Hi-Lift, sand anchor, ramps, trash bag, Pooh bucket, fold down table & any pouches attached to table, Stove, food coffee, butterfly net...) and it can easily exceed 300# static.
That is a lot of weight hanging off that end cap. start bouncing the Jeep around while climbing in and out, and it can almost double the weight.
Hope Teraflex is listening, because I really like the concept and their quality, but I'd want a substantial reinforcement to the body tub, and a totally different accessory bracket that would allow a more standard load configuration with a basket above the tire (like moabian said), in order for this to be useful to me for camping/overlanding.