i went the cheap route and got a handfull of rear cargo securing thingies from a mitsubishi montero at the junk yard for free, isuzu trooper has the same thing. they bolt in with one bolt and fold up/down. i have 6 in the back floor and a couple on each side. i usually put most things in those plastic crates with the folding/interlocking lids. it works great with ratchet straps, and elctrical wire pulling flat rope is the cats meow. i also have a cargo net, not bungy type, that i can throw over the whole mess if need be, it has little (eyes) all over it for easy securing. military style.
i have a 60" hi-lift mounted across the rig right behind the rear seat, i made stud mounts that are attached to the rear seat "pillars". this does a couple thing for me, it gives a nice little secure cubby of space behind the seat for water jugs or similar sized items, and it devides the front/rear cargo area when i have the seat down.