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I think the limit on a category B licence is 3500kg combined weight of the car and caravan or something like that

If you passed your test before 1/1/97 then you can tow an outfit that totals up to 7500 Kgs max weight, or a tow vehicle up to 7500 with a trailer up to 750 making 8250 altogether.

If you passed after 1/1/97 then you are restricted to 3500 Kgs (or 4250 if the trailer is only 750 or less)

So if your car's max weight is say 1800 Kgs and your van is 1200 Kgs MTPLM, that together gives a train weight of 3000 Kgs which is within your limits.

Note that it is the maximum permissible weights that must be added to get the Gross Train Weight, not the kerbweights, unladen weights, MIRO or similar.