the 1200's are 94-96 HP stock and I still believe the crank and other parts in the motor would start to crack and get metal gear shaving's in no time from towing around cars with a steet bike.
like my OP there a luggage rack with wheels and a handle bar and by no means a powerhouse dont matter even if it has a v8 in their becuase their still nothing like a car or truck's V8 by any means.
they make a 6 cylinder snowmobile too but you won't see them pulling cars out of ditch's in the winter either

here's the towing specs for their 1800 model wich is one of their largest most powerfull models torque wise:
Goldwing 1800 towing capacity: Maximum tongue weight of 75lbs, absolute maximum towing capacity 500lbs, total load should never exceed 1/3 of the weight of the vehicle.
last I knew there was not too many 500LB cars out there and actually my banshee quad weighs that so even towing it would cause strain as its at its absolute maximum towing capacity wich I am sure is already at the point of causing some damage even it were just under 500lb.
might as well use a 6 cylinder sea-doo or wave runner as a tug boat while there at it.
another thing to consider too is a honda v8 is nothing like a chevy v8 ford v8 dodge v8 power and torque wise etc. otherwise the guys on the drag strips and what not would be running them honda does make lawn mower's though so maybe they could use them as road graders.