Hello Rubels,
I have a feeling this might not apply to you, but i should at least raise it with you . Bearing in mind you are discussing a moderately heavy caravan and a Volvo XC range vehicle there is a strong possibility that the outfit may exceed a combined MAM figure of 3500kg, and if it does the driver must entitlement Be or B+E on their driving licence.
If you passed your basic driving test before 1/1/1997, the you will automatically have "Be" If you passed after that date you will have "B" with no extensions and that limits you to driving an outfit of combined MAM not exceeding 3500kg.
The combined MAM is the numerical sum of the Gross Vehicle Weight of the car + the MTPLM of the caravan and it cannot be fudged by only part loading teh combined MAM remains the same.
You can extend a "B" to B+E by taking the extension test
(EDIT) I see from another thread that you dis pass your test before 1/1/97, so licence is not a concern - Good luck