The greatest thing i ever did was get the Front Runner drawer system, this drawer is taller than most but when you put the rear seats down you can put a sheet of plywood across them and its level, makes a sleeping base from the rear window to the back of the front seats. you can PM me and give me and ill send pictures via text, not sure how to upload pics onto here. The only downside is that the drawer is a bit taller than most so some cargo area is sacrificed.
You can upload the pictures to something like imgur or flickr, then post a link.