I'm heading off to Ukraine on an aid trip with my 2014 VW Crafter LWB. I absolutely rammed it full of wheelchairs, zimmers, crutches, blankets, and about 50 large boxes of medical supplies. It's my 3rd trip but first in this van which is now overloaded. I'm sitting on a gross weight of just over 3800 kg. How much weight is too much weight? I am reluctant to remove anything but I need to know how much I can get away with, should I just put a bit more air in the tires and craic on?