Your 'House Batteries' need to be matched to your 12VDC electrical load, and to your charging method and capabilities. Correct charging is critical to the longevity of the battery's life. Basically, you need to stay away from marine type 'deep cycle' batteries, which are actually a hybrid type, meaning part 'Starting' and part 'Deep Cycle', neither of which give full performance in either category, and go with a true dedicated 'Deep Cycle' type.
Personally, I went with two
Trojan T-105 6VDC golf cart batteries, wired in series. I will (primarily) be charging them with a
Magnum-Dimensions 2000W 12VDC Pure Sine Inverter Charger, which is a four stage charger and has a charging capacity of 100 amps DC. I'm starting with these two batteries, and if my 12VDC increases, I'll add two more.
These are some of the articles I used as a reference when making my decision.
Choosing The Best RV Battery: Which Is Right For You?
http://www.doityourselfrv.com/best-rv-battery-choosing-reviews/
Thread: 2- 6 volt batteries or large 12 volt battery
http://www.expeditionportal.com/forum/threads/50122-2-6-volt-batteries-or-large-12-volt-battery
Thread: which? two 6 volt or one 12 volt battery?
http://www.expeditionportal.com/forum/threads/122111-which-two-6-volt-or-one-12volt-battery
CAR AND DEEP CYCLE BATTERY FREQUENTLY ASKED QUESTIONS 2015
http://jgdarden.com/batteryfaq/carfaq.htmI have not purchased a refrigerator yet, but am leaning towards the 12VDC/120VAC portable chest type due to limited space. A lot of people use the small home or apartment type units, but if you do it needs to be a good quality one to withstand the bouncing around a vehicle causes, especially a 4x4 one.
The dedicated RV type that run on 12VDC/120VAC and propane need to be perfectly level when operating or damage will occur. They types that use a compressor don't have this requirement, up to a certain point. If you can afford it, the marine units are your best bet and they will operate in pretty much any position, within reason.
Here are some Search Results from Do It Yourself RV about refrigerators...
http://www.doityourselfrv.com/searc...:10&ie=UTF-8&q=Best+RV+Refrigerator&sa=Search