This is a photo of a crew routing an exhaust vent out of their way. There are 2 men holding the pallet upright while the third man climbs up to route the exh duct.
No problem if it has a #1A rating. Did they check the label? If it has a #2 I wouldn't be caught dead of it and #1 rated are a bit unstable. But they're not going up that high so they may be able to get away with a #1 an they won't fall that far.