I will add to this as he does more and/or I get around to it so come back sometime and to what's new.
WATER.
He had the tanks installed by the people he bought them from but he has connected hoses and taps to each tank and there is a tap both sides of the vehicle.
BED. We started with a swag on the tray. First time we did that it was so cold. Next time we laid a mat down first and that was much better. We had the swag and piled everything in and around that when we went anywhere. Not the way I wanted to do things. He thought to make a bed frame so that we would have storage under that. Good idea and his choice of materials was the same tubing he used for the bed in the van.
You have to make sure that the boxes you have fit. Once that is done then you weld it together and lift it onto the tray.
The box in the back corner is the loo that I take. There is a curtain that goes around that so if we are ever out bush I don't need to worry about *bities*
To make the frame more secure he has dropped a bolt down through the tubing, drilled a matching hole in the tray. Drop the bolt down and it fits into the hole so there is no movement of the framework. A bonus is that the bolt pushes up again and the framework could be used in the house as an extra bed if we ever need it.
LADDER.
I am short, unfit, no strength in my hands and arms...anyway I sometimes have trouble getting up into the trayback. Hubby found this and we used it our last time in Hopetoun. Oct. 2011
He has since made a better, stronger one out of the leftover tubing from the bedframe. It is easy for me to pull out and put in place.
We now usually take a mattress and sheets and a quilt/doona instead of the swag.