Team, I have a D22 ST-R 2.5 litre diesel nissan navara dual cab, we have purchased a 17foot caravan weight is 1500kg empth with max load 1800kg. Will the D22 handle it or should I go for a larger capicity motor like the D-40.D22 is rated to tow 2800kg with brakes. D22 doesnt appear to have a lot...