My bro is a car transporter and he's hauled a lot of 5 series from auctions at Manhiem, NJ and Newburg.. Says he brought in a silver M5 '06 once.
He likes the BMWs over the Mercedes because he claims high power automatic cars don't have much soul. I differ because I can't drive stick.

I went with him one day and took a new 3 series for a spin around the auction lot and it was loads of fun.

Most of the cars there are bank, law enforcement siezed.