Latest addition to the rig, a Thule Evolution 1800 cargo box. We did a quick trip up to the Lake Isabella area followed by a back road route east ending up in the Red Rocks region near the 14. This trip actually had four passengers in the 4Runner so I anticipated a need for more cargo space. As expected, the 18 cu. ft. of additional space was jam packed with personal gear bags, sleeping bags, tents, and chairs. The rear cargo area housed the fridge, kitchen supplies, and other camp odds and ends. There was still cargo spilling over into the rear passenger area

...It's easy to see why the 80 series LC is the obvious choice for wheeling with a family. I had been surfing craigslist intently for a 1600, but wound up with an 1800 after the seller listed incorrectly. This was a blessing in disguise as the 1800 ended up being filled to the gills after all.
I added a couple 1 1/8" U bolts to secure the box from shifting while offroad, it didn't move an inch after that. If need be in the future, I can always shift the box over to one side and build a narrow cargo rack for the other. This would be a good option for hauling firewood, etc. (though that rarely happens as it is).