Aut cum scuto aut in scuto
Isn't that a prop test stand?
That would be my educated guess
No that's to small. The prop weighs well over 1000 pounds and has ether an hydraulic or electric control hub.(they used both) That is simply the standard moving rig used by flight line crews. It can carry two props at a time to the repair bay. The object behind the prop feather controller is the cradle for the second prop. The crew member is tying it down with rubber bunji's.---Ray