Now if Macgyver did make this he's have it as a soft projectile firing platform that would render the baddies harmless without actually hurting them!
But it's actual intention is for filmmaking.
Have you seen those shots of the actors walking along the street in conversation?
The 'track dolly' is one way to film them as they move along.
Heres a video on another cheap solution to give you 'pro' like results: