On my '05 Windsor, I removed the chassis batteries and moved them into the engine compartment with a custom battery bracket. I then put four more house batteries into the battery compartment. I normally use Interstate batteries directly from Interstate and they last about 5-6 years. This time I replaced them with Trojans. Hopefully I can get longer life out of these.
We almost always boondock with a residential fridge and never had a problem. I do use a small 2000W generator which I start about 7-8 so the wife can watch TV and cook. I will run it until about 10 pm to charge the house batteries for the night.
Tim
05 Winsor PDQ