This is not a situation that I would want to be involved with; however if you guys want to buy and the 'boyfriend' shows up with a few of his prison buddies to repossess his tank I got your back.
My # is 303-555-1212.
i say we all just get together and take a couple trucks down, pick it all up and split it up!
That way if dude shows up, even with friends, we could just run him over! LOL