I really don't think the 1.4 in the Golf would be strong enough to pull a Car trailer, let alone a car transporter with a car on it. That's what the TDIs are best for. The clutch wouldn't be up to it at all

The swan-neck tow-bar which most VW garages supply doesn't require the bumper to be cut

 

Swan neck bar might required underside of rear valance to be cut, small, and not very noticeable.

1.4 towing car = bad idea.

 

They all need the bumper cut.

 

I got one fitted on my Mk5 last week, nasty bumper cut. Mk4 cut is only small.

 

Remember, pulling is only part of the job, stopping is the other part. I'd be wary of the effectiveness of the standard brakes on a small car pulling another car, especially one which would exceed the weight of the Golf. It's not recommended to pull anything weighing more than 85% of the pulling car.