I'm just about to do a page for the TV series "Long Way Round" documenting Ewan McGregor and Charley Boorman's round the world motorcycle journey. Both of them used BMW R1150GS bikes, with a third one ridden by the cameraman. McGregor and Boorman's bikes will be 5-star vehicles, should they have an entry each or one entry for all three since they are virtually identical?

If the three are exactly the same, I would list the vehicle only once.
Are they the same color? Or do they look a little different?

All three are basically the same, they are made in the same year and are the same colour. Ewan and Charley's bikes last the whole 20,000 mile trip and the cameraman's bike is more of a 3-star vehicle.

Well, I would only list the vehicle once then.
There are several movies where multiple identical vehicles are seen; they are only listed once in this case.