I'm 20, and have towed a caravan along with numerous other things, LEGALLY.
The way i interpret the law is that, aslong as the trailer laden does not exceed over 80% of the weight of the car, and your gross weight (weight of car and trailer laden) is not over 3490kg then you can tow with out a B+E.
However, if you you are over 80% then you need a B+E or if you exceed 3490kg then you need a B+E, and also a tachograph fitted to the towing vehicle.
I'd also like to note that this is just my interpretation

Hope this was some help
