Follow the standard rules for transferring a passenger vehicle in your state.  

My neighbor would always lock his car doors, but one time he forget to lock the passenger door.

If you agree with my perspective on #2 above then I suggest a 7 passenger vehicle because some of the time the Buyers (especially if they are from out of state) will have their kids with them and a 5 passenger vehicle will be small.

They start turning the wheel and the passengers cant feel it moving in the other direction for a few minutes. 

The boat has more passengers :) I'm also in a very expensive area that makes sensible investing nearly impossible.

If you're going to be driving the car and your investors are passengers with no control then you're selling securities; period.Don covered the salient points above and hopefully scared you sufficiently to seek the counsel of a securities attorney instead of relying on advice from people on message boards.  

From what I understand, since they are on a trailer, they are generally regarded as personal property like a boat, RV, passenger vehicle, or even mobile homes depending on your state.

Motorcycles must have exhaust muffling comparable to that of a passenger car.

It would definitely be neat if train-based passenger containers were developed.

Im currently driving passengers part time...Thank you!