I have a Navara stx v6 550.Can I tow a 2.5 tonne van legally

[Rice]

The STX-550 is rated as having a 3.5T towing capacity, the previous owner of my Navara had intentions on buying and pulling a 32foot caravan but was transferred so that fell through.
PS, just seen Old. Tony's attachment and correct myself to 3.0T, apologies.