Those 24's will do it. they wont let him run it in and out and landing gear too many times in a row but you know what I'm saying. 24's are the smallest group battery. Mine had 3 of them 14 years old and one still had enough guts to almost put the slide out.
My battery box was too shallow and they had to go in through a side compartment door. I can fabricate and weld so I gutted the tray/box and built a drop down tray that I use a floor jack to raise and lower. It bolts into place at 4 corners. It now holds four GC2 just right.
But it all depends on what a person wants to use it for. Two gc2 is a nice upgrade for many and gives a good deal of flexibility if needing to do a wally world stop or whatever.