Hi Simon, that is a great place for you to test out your truck, it's almost in your backyard. I think you should be fine, you have diff locks and low range don't you.
Hi Ian. So I'm almost at the point of interior cladding. We have started insulating using 50mm Kingspan fitted in the sections between the frame and bonded to the outer aluminium skin. I've tracked back through your thread to here, to see what you did. It looks fairly similar.