Just because the manufacturer has not specified a towing weight does not mean it is illegal to tow with it. The RTA (NSW) rules specify what rules apply to cars without a towing weight.
Quote:
If the vehicle manufacturer has not specified the maximum towing mass, the maximum towing mass is:
One and a half times the unladen mass of the towing vehicle, provided that the trailer is fitted with brakes which are connected and in working order, or
The unladen mass of the towing vehicle if the trailer
does not require brakes
So looking at that you may be better off with a Cooper S
OK, so then as its a chassis modification you'd really need to get it engineered then to be legal. Really don't think you'll find someone who'll engineer it!
