I doubt that you can make it, but here is a little test.
- Unplug your rig and let the battery rest for a few hours.
- Measure your battery voltage. It should be about 12.7 to 12.8 volts.
- Turn on ref, h2o heater and anything else you expect to use constantly and let it run for a week.
- Guestimate how much water you plan to use and turn on the water pump and pump that amount of water out of your tank (obviously, you will need to first put water in the tank).
- Guestimate how long you plan to leave which lights on total and turn them on and let them run for that amount of time.
- Radio or small inverter to charge cell phone batteries, same thing.
- Turn everything off and let your battery rest for a few hours and then measure your battery voltage.
If you are at 12.2 volts (or greater), then you should be good to go without doing any harm to your battery.
If lower than 12.1 volts, your battery life will be diminished over time....assuming you make a habit of doing this.
Have fun experimenting,
Steve