Cost:benefit ratio.
Towing w/ X5:
Car trailer: $4k
Hitch: $1,200 installed from BMW
Extra wear on X5, mileage, etc…: $???
Total: $4,200+
Towing w/ M3:
Trailer: $220
Hitch: $500?
Extra wear on M3 (which I don’t care nearly as much about): < X5 costs
Total: $720+
Since the car doesn’t have a cage, I see no reason to tow it w/ the X5 yet given the costs associated. Not to mention needing to store the trailer somewhere over the winter, or even between events, will make it a pain in the ass.
Plus the hitch assembly for the M3 will add some rigidity to the rear of the car. :rofl