?? 6 or 12 VOLT BATTERY ??

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Have you done an energy audit of the items you intend to run?

I would strongly urge you to consider a gasoline generator rather than a propane--unless you plan on having a 1000 pound propane tank.

A small cabin is a little different then an RV.
I would install two systems. A 12 volt system and a 120 volt system.
Run standard NM type wiring for both, then when and if commercial power becomes available it would be easy to change out. Use separate boxes for the systems
Buy a standard RV power distribution panel and converter. Power from the genset would feed the panel into the 120 volt portion and power the converter.
You can then use basic LP appliances with 12 volt control for the refer and furnace. Lighting would be 12 volt.

If you have a sunny spot, solar power makes a lot of sense. It will relieve you of having the generator running to recharge the batteries.

Depending on what you are trying to power in the camp, will dictate how much battery capacity you'll need. Inverters will use up battery power quickly if you are using high draw power devices like coffee makers and toasters, etc.

Here is a downloadable spreadsheet that will total your power use: Quartzfest power program

FWIW, I have the Sam's Club Duracell 6V's in my rig. They are on their second year and are performing well. I just checked the Specific Gravity on them, this morning. They have been continually charged by a solar panel since new.

I need to purchase two Batteries. I was thinking about 2- 12 volts in parallel but it sounds like 2-6 volts in series would be better.

Local Sam's club sells Duracell Golf Cart Battery GC2 for $84
Specs are:
•20 amp hour rate:215
•5 amp hour rate:157
•6 amp hour rate:156
•BCI Group Size:GC2
•Minutes at 25 amps:395
•Minutes at 75 amps:105
•Volts:6

Also has Duracell Group Size 230 for $112
specs are:
•20 amp hour rate:230
•5 amp hour rate:174
•6 amp hour rate:178
•BCI Group Size:GC2
•Minutes at 25 amps:448
•Minutes at 75 amps:120
•Volts:6

Probably going with the $84 version

TO CLARIFY: I do have a 28 foot camper trailer. It works great! I am talking about running a small hunting camp (less than 600 square foot).

Quote from National Grid came in at $10,000 to run the power line 400' to the camp. WAY TO EXPENSIVE!!

I am planning on running a propane inverter/generator(Yamaha EF2000iS)for AC power which will also be charging batteries(It looks like two 6 volt in series at this point). Then, when I shut off the Yamaha, I will flip the transfer switch to use a battery bank (DC) coming into a power inverter (AC) to get power to AC loads

Does that make sense?

Do myou have an Inverter or a converter? An inverter takes 12 volts DC and makes 120 volts AC A converter changes 120 volts AC to 12 volts DC.
You may want to read through this.
12 volt side of life

Does this sound right?
To connect charger to battery bank/battery bank to inverter
Bat A+ to Bat B-
Bat A- to Bat B+
Charger+ to Bat A+
Charger- to Bat A-
Bat B+ to inverter+
Bat B- to inverter-

Welcome to the forums.

If you plan to camp without shore power, it is usually best to maximize the number of amp-hours of storage.

This becomes even more important if an inverter is going to be used.

For serious off the grid camping, consider adding a solar system for recharging.

If the batteries will be hard to service, consider going to AGM chemistry.

I did not write this but I think the information is really good.

http://www.marxrv.com/12volt/12volt.htm

I got 2 6V batteries because of the amount of the battery that you can safely use.