The only safe way to transport a BMW is to put it on a flatbed truck. If you tow using a hitch you risk damage to the rear differential and/or the transmission.
yes
Carefully
no they'd fit a bike.
No
One can purchase a BMW Towbar from: eBay, Solent Tow Bar, BTM, Witter Tow Bars, Caravan Club, Bid or Buy, Tow Sure, BMW Land, Aliexpress, My New Cheap, Mister Auto, Practical Caravan, to name a few.
Yes
of course same lug pattern 5x120
5x120
1996 BMW 750
Bmw 750 hybrid
One could purchase a BMW 750 from a local BMW dealer who is likely to have access to several models. Alternatively one could look on Autotrader, Kijiji or eBay Motors and look for a seller close by.