We have a side conversion which looks very similar to this

Unfortunately the bed construction isn't fantastic because it doesn't allow many options for storage. You can jam things in from the rear but when you need to transform it from a seat to a bed or vice versa you need to pull out all the stuff you had jammed in there so the little wheel supports can roll freely... check out some photos below (taken from the rear of the van) to see the design I'm talking about:



and you can see the seatbelt coming up from a floor mount in this shot:

I currently get about 11cm clearance (measured from at the rear) for storage but the 2 sets of wheel based supports get in the way of doing much in there permanently such as putting plastic containers or a strong box (which is what I want).
Ive seen other rock n roll beds that have areas for storage, water tanks, safe boxes etc... and I think I need to upgrade.
Can anyone provide some advice or options? This is a perfectly comfortable design for sleeping on but Im totally missing out on utilising the under bed space.