The atmospheric pressure is so low that you don't need a tube at all (<1% of Earth). And you'll have to use wheels instead of hovering because you can't suck in

The atmospheric pressure is so low that you don't need a tube at all (<1% of Earth). And you'll have to use wheels instead of hovering because you can't suck in enough air to eject out the bottom. At that point, you no longer have a Hyperloop, you have a car (or train).