Love them or hate them, massive lenses are just a requirement for certain types of photography. Sports, wildlife and other forms of action when you’re shooting from a distance all need them. Their size makes them a pain, though.
Even with a monopod, they can be quite difficult to shift around on location, especially if you need to act quickly. Colin Brister, though, has developed a solution. It’s called the SpeediGimbal (buy here) and you can stick it on the monopod you already own.