I movie I recently worked needed me to shoot some long FBI style photos that would be featured in the film. I initially shot them with the 200 f/2L but the director said they didn't look long enough so I rented a 500L and went on a reshoot. Yes, a monopod probably would have been a good idea but I decided this was a good time to do some working out and just sucked it up and lugged the thing around for the full week.
I won't lie. It was heavy and towards the end of the day you could visibly see me shaking but I got through it and will never complain about the weight of any of my lenses again.
Thanks, Lensrentals for a great piece of glass.