xxx: So I thought about it, but if I hang up the tank to the ceiling, many will suspect it.

In Stuttgart, in the Porsche Museum, a non-epic sports car hangs on the ceiling. And next to the inscription: "According to the pressure force theory, when reaching 321 km / h this Porsche 956 can drive on the ceiling."
It's all about smart inscriptions - write something about secret military suction =)