Just because they say it cannot be done, does not mean that we cannot do it. This was a tricky job where two 4000lb tanks needed to be rigged over a wall (bulkhead).
A traditional crane could not be used for this job. We had to rent a portable machine that folded down so that it would fit into an elevator. We then set it up on the roof to use like a crane to hoist the two tanks over the wall and set them in place.
Even though this was a challenge, the crew was up to it and they even received extra points for ingenuity.