I once transported an older BCS715 with rototiller, a BCS/Mainline SEPP with rototiller and another rototiller, all at the same time, in a Kia Rio sedan.
The way I did it was to take the motors off, the wheels off, the implements off, and the handlebars off. (If anyone is in Southwestern Ontario, Canada and wants an old Mainline tractor for parts, send me an email and maybe we can make a deal.)
If you do go this route, make sure you take some wood boards and thick cardboard with to protect the inside of your car. These older tractors tend to leak oil here and there.