Hello John George,
It is difficult to give you a definitive answer as to what is safe to tow. Safe towing is the combination of a number of factors, or which towing weights is one, but in my view not necessarily the most important.
Some of us are quiet happy to tow a trailer up to the permitted weight of the car, even though it can be greater than the weight of the car, Others choose to limit themselves to 100% ratio, and some choose to limit themselves to a lower figure such as 85% (the guideline suggested by the CC).
Out of this though comes the generally accepted view that it is wise to keep the weight of the trailer as low as possible.
You do not give sufficient information about your specific car to enable me to get all the data to calculate you actual towing ratio. (MTPLM of caravan divided by the kerbweight of the car all x 100) but my guess is that you will be close or above 100%
Another factor I must alert you to is a legal matter. If you passed your driving test after 1st Jan 1997, then unless you have taken an extension towing test, you are legally limited to a trailer that cannot exceed the kerbweight of the car, and even if you don't load every thing to its limit, the combined Maximum Authorised Mass of car and trailer must not exceed 3500kG
My gut feeling based on what you have told us is that the proposed combination is possible but not recommended especially if you are new to towing.