Have a look at the Caravan Club site - there are articles on towing and also matching your outfit. I believe you need to register to use the facility but don't require to be a fully paid member (I could be wrong) but why not give it a try.
Just to make licence clearer.
If you past your car test after 1st January 1997 you will have a Category B, which means you can drive a vehicle up to 3500kg GVW and tow a trailer up to 750kg GVW.
If the trailer is more than 750kg then the combination of the vehicle and trailer must not exceed 3500kg.
The trailer must not be more than the vehicles unladen weight.
These relate to the PLATED weights and not the actual weight.
It is too easy to find that you may not have a licence for the vehicle and trailer combination and then a separate issue relating to overloading.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.