I built a drawer slide / baby changing station / camping setup for the back of our 5th Gen TEP.
I wanted it for camping, but sold my wife on the idea by branding it the baby changing station. Pics here:
CowboyTaco's '14 TEP Info | ToyotaOff-Road.com
It started as something of a necessity (at least in my eyes). We went on road trips a lot before having kids. With a cargo area full of luggage and miscellaneous stuff, I had nowhere to change our daughters diapers that was level. Trying to do it on the backseat was problematic, especially for an infant who rarely sat still. I also hated the fact that there was no concealable storage in the 4Runner anywhere other than the center console or glove box.
From then on, we got compliments on it every time it was used. People would come up to us at gas stations and ask where they could purchase something similar.
Made from 3/4" plywood and painted with Rustoleum black paint, this thing is super sturdy and rugged. The black color blends in the the rear of the cargo area and is mostly unnoticed when not in use. The finger slots are routed and sanded for smooth grip and a firm pull. The soft-close ball-bearing drawer slides keep the drawers closed (mostly) and keeps you from slamming them shut. I say "mostly" because they will open into the back hatch if there is a lot of weight in them. This is a simple fix with a lock of some kind, or even simply a pin to insert. (A lot of weight being a 12 pack of soft drinks + recovery gear + other essentials. Remove the soft drinks, and they stay closed.) The drawer sliders are rated to handle 100 lbs of weight.
This one is almost finished and ready. I need to sand some more and apply the final coat of paint. Once that is done, I'll install the anchor points where it will attach to the factory cargo anchors.
Designed for the back of the 5th gen, I've confirmed that it also fits in a 4th gen.