Sorry, but my screen starts jumping around like crazy after a paragraph or two.
Anyway, as Mr Whealtor said, your tires will wear out fast in the middle. If you get SC specific tires and take the tub off, going through turns feels like falling over.
Also, the extra weight will greatly reduce gas mileage and slow the whole shebang down.
OTOH, cute sidecar rigs have TONS of pick-up power. Pretty girls will fall off the curb waving at you and asking for a ride. If you have a dog, you will become a god to him. Well- more than you are now, I mean.
If you decide to get one, learn and practice with ballast.