I'm probably buying a used high tunnel or greenhouse this week...

The hoops are made of tubing and the ends have been drove in the ground.
Pulling these out without crushing will be a trick. I've got to do it 50
times. Worth making some sort of contraption. I know the O.D. is nominally
1.6" but not sure of exact number.

I could drill the O.D. between two steel blocks and then use 1/4" bolts to
clamp together. Then a loop of light chain to go around a long 2x4 for a pry
bar. This would work but it would be slow.

Better ideas?