Hi Stone,
Yeah, your not allowed to carry a load. You are allowed to carry goods or burden that are for living purposes, so clothes, boots, push bike, food etc are allowed. The design of the interior should be such that you aren't "able" to carry a load, that's why the stated items must be permanently fitted to the bed and/or sides of the vehicle. The bonus doing it this way is that you don't need to fit side or rear impact protection or a tachograph. The guy I'm talking about has a 1989 AWD Bedford MJ. It should be down at Trucks and Troops if your going down to that show as that's where I was chatting to the guy last year.