Sidecars are great if the reason is to carry kids , pets, or lots of stuff... I've had three (3) the latest is a two (2) place motorvation rig on my '96 Trophy III. Took the son to New Mexico last year and before that a longer trip to the Grand Canyon and Durango Colorado. It is fun in as it is unique but outside of the novelty, Bonnie is much more fun to ride ( my solo bike) .. An old 95 or newer Thunderbird would work just fine with a good hack... over time the dynamic forces will bend the frame on the bike so it ends up being good for only a sidecar. i.e. if you do it, dont stick it on a perfectly good TBA or Speedy unless you have compelling medical reasons. ( lack of limbs, etc)