Thanks
I will be plating the open ends of the box section and welding them to the chassis oof the car, the chassis has two rails front to back, we inserted 2"x2" box section in to these for added strength, the center section of the towing frame is extended back to the middle cross members of the chassis.
The second picture was just a temporary job so we could move it.
It will never be used as a camper as it was built to use at shows to demonstraight a portable kitchen we manufacture, many of the shows wont allow a vehicle on the display pitch but you can have trailer, so as our kitchens are designed to be used as in or out of a car we then built this.
UK trailer laws are changing, I feel its only a matter of time before we have to pay a tax on using one like with a car it can be £0 - £500 a year.
At the moment if you buld atrailer it must have a test, its quite simple but lots of things they can reject it on and we just dont need the hassle right now, but the law doesnt come in to force unti 2014 for Caravans, so it will be a nice project and show piece to make it in to a useable caravan.
Has any one got any pictures of how I could make the fold out bit to extend the bed?
I have found some good ideas on this spanish forum
http://www.furgovw.org/index.php?topic=174565.30