This could be the BBCs greatest challenge yet. Mind you, they managed to lose a million man march over Brexit, so I am sure they are up for it.
On a serious note, the best protest would be a completely silent one, where there crowd turned their backs in a Mexican wave as the TrumpCart passes by.
I am sure it could all be easily coordinated with an app for demonstrators to run on their phones that vibrates as the cortege passes by them. They could start their pirouette when the phone vibrates in their pocket.