Go by plated weight. The log book figures are more to do with taxation class (which have changed resulting in Landys getting weighed at MOT time)
Carrying
If the vehicle started life as a 110 hicap then its plate should say 3500kg , as the 110 standard is 3050 (unlevelled version ) that is with no boge hydramat unit underneath. With levelling its only 2950. I am not certain if VIN actually contains that info. You could try contacting Land rover to get what your vehicle was built as. With that info you would then just need to do a paper exercise with dvla . If that is not possible then you will need to find out what other than the springs were changed by landrover for a 3500kg rather than 3050kg . HTSH
I just hit a problem with my 110's MOT as the test station wanted to do a Class VII ("seven") MOT, a bit of a shock, and searching here I found this post:
I phoned DVLA and they suggested I show them the log book which on mine reads 3499kg, which I believe is Class VII.
Coming home I found this post: http://www.landyzone.co.uk/lz/1062109-post22.html very informative but I am not sure why the 110 is different (as per that post). I haven't been able to check my VIN plate.