The structure is built from 2" aluminium box section, and is attached to the cut body by stainless steel bolts. There is in places, steel welded to add strength across the back where the door has been taken out and from the c pillar across the back too. This build is permanent, nothing is removable at all. I did not want to bugger about taking anything on and off and to keep reducing strength. It is built for many trips. The ladder is in a storage compartment under the spare wheels, which stretches out when needed, and you get in to the bed up top from the outside. There is still 5 usable seats which I need for my lovely kids, who go adventuring with me, and they love the truck.
I could have built a trailer, but after seeing a DVD with a trailer having an accident with two young kids in it, I decided not to. The land rover and trailer jack knifed on a trail going up hill. It didn't make it, and rolled backwards quickly. Thankfully the kids were ok, with little bruising, but I didn't want to risk that. Plus I can still go at motorway speeds without worrying about a trailer fish tailing behind me.