Golf cart batteries at the end of the day will give you more useable amps.
Unless your willing to spend big dollars you will not get a true 12 volt deep cycle battery. What you get for a hundred dollars at WalMart etc is a dual use battery. With golf cart batteries you get heavier plates for more deep discharges with less damage, which equals longer life. But to get the use your thinking about you will need 4 or maybe 6 golf cart batteries. Do you have that much room to spare?
Also, unless you do a LOT of dry camping, and have a means to recharge them do you really need that much power?
It might be more economical to to change to LEDs, and pracrice better power managment. Just saying.