What are you going to use it for?
I guess you need to sit down and ask yourself a few questions before you
purchase your battery(s):
Are you just going to be camping at sites that provide shore power?
-- If so the standard marine size 24 marine/RV battery that comes with most TT's is fine.
Are you going to be dry camping (no shore power)? You will want to go with TRUE deep cycle batteries and not the standard TT supplied batteries. They supply power a lot longer than the std size 24 batteries.
You will need to get a better understanding as to what electronics you will be using while dry-camping. Get your pencil and paper out and start calculating the drain from each of the items you intend to use while dry-camping.
You will also need to address how you plan to charge them during your dry-camping expedition.
Let us know how you will be camping.
2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package
Our Solar Album http://www.jaycoowners.com/album.php?albumid=329