Fridge
Alright,
Here is my contribution to this:
I bought a 50QT a few years back and let me tell you its awesome!!!
I have camped with my wife on 9500 mile trip from Canada to US and back Edmonton/San Diego/Edmonton through Moab and such. This thing is amazing. It is not about what you "need" vs. "want" like it was mentioned if we lived life like that most of us wouldn't be driving 4Runners with expensive mods period but a Honda Civic or something. That being said see if you have a 4x4 shop/ Toyota shop in your local area, they might have a floor model for cheaper, maybe EBAY for a used one?
The biggest advantage is being able to keep constant temperature and DRY cold. Dry is the biggest thing, no more wet chocolates, soggy cookies, Veggies and meat in opened packs all stay dry and fresh. Then when you run low on food and its just drinks, crank it down to - 4C and keep your beer COLD.
I leave mine in the summer. It is unplugged most of the nights but if I know i'm going camping or even to the lake later in the day or playing a soccer game with the boys in the evening, load it up with beer and plug it in in the morning.
Now when I went camping, I leave it plugged in all the time. 2-3 days in the wilderness is no problem. Always fresh, cool, and constant fresh and DRY produce.
I have wired #10 AWG CCT straight from the battery with an inline fuse along/underneath the front cross member, then through the firewall on the passenger side and along the foot boards which already have channel for other wiring and hooked it up straight to the stock 12V at the back. This way I have constant power at that outlet whether vehicle is running or not.
Photos of my drawer system and ARB Fridge from my Landcruiser, 4runner has the sliding tray and I just secured it with bungee cords to the tray. Unless you are doing Tokyo Drift, it wont go nowhere, especially loaded with wobbly pops, however i'm planning on buying ARB drawers for proper set up.
Hopefully this helped you.