Uh huh.... Better be a long low ramp. That's a HUGE amount of weight to let go like a roller coaster on steep decline! Pity the person on the bottom, guiding it! Or on the top, for that matter, trying to keep it from careening into the street.
I'm picturing Abbott and Costello, Laurel and Hardy, or Keystone Cops here. Ok, so they've got a piano, instead, but still....