I think it is important to have a toilet up on this roof rack you mentioned, very unique idea, I have never seen an automobile with a rack or cage on top. We all need to use bathroom on long trips, there is really no place for that inside the Hummer, a spit bowl gets spilled easily. How about a port-a-potty on top of the Hummer? you can easily get up there through the sunroof. There is no storage tank issue, just let it go.
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