I couldn’t find any info on the Volkswagen MK1 Rabbit (Golf) but the MK2 Rabbit (1985-1992) can tow up two 1,000 lbs (US) with a standard hidden hitch receiver (I’m guessing it would be a Class I receiver hitch) A Class II receiver hitch is/was available, but requires underbody modifications to fit it (sounds expensive)

@ingo, yes a vehicle can tow slightly more if the trailer is "braked" (has it’s own set of brakes) Then the vehicle does not have to stop the trailer by itself, the trailer helps in stopping making for shorter stopping distances, and also less wear and tear on the TVs (tow vehicles) brakes.