I used to be the sidecar tech when I worked on Harleys. Make sure you get the toe set correctly or they're a real bitch to drive. Hearing that starter being used for reverse on the baggers....ugh.
My favorite install/setup was a sidecar for a certain energy drink, and the car was a fiberglass rocket-shaped cooler. Two cute ladies came in to pick it up, they were to drive it around large outdoor concerts and hand out drinks as a promo. The guys in the shop got free drinks.
Similar to this, but I can't remember the drink brand