There are many threads about this over on the other board as well, here is one with links to several others in it..
Realizing most of those are pretty old, and that many of the links no longer work, but there is still a lot of good information in general in them. My thought process is CCA's are mostly a non issue, as most batteries produce plenty. That being said, I also believe the higher the better when you are running a winch, as the more current it gets, the cooler and more efficiently it runs. But AH, or Reserve capacity is going to give you a better idea of how long it will run, or how long you can run accessories (engine off)..
For a basic single battery replacement I recommend (and currently run) a simple
Interstate Commercial Group 31 battery (950 cca, 196 min res). It is a age old flooded electrolyte style battery (semi-sealed, but its going to leak if inverted)..
The
Odyssey PC2150 is of course a well regarded AGM choice (1150 CCA, 205 min res) that is the same footprint, slightly better specs and a sealed AGM design, but is also more than twice as much as the traditional Interstate above..
Another great choice that I don't hear mentioned often is Lifeline batteries. They have a Group 31 (
GPL-3100T) with a 950 cca and 225 min res rating. Again, same basic size/footprint as the above two, but also not cheap..
For Dual batteries, I've always wanted to set my truck up with dual
Odyssey PC1500s (850 CCA, 135 min res - or 1700 CCA and 270 min res wired in parallel)
For a wildcard, you might be able to make two
Lifeline GPL-4CT's fit/work. You'd have to get creative, and It be a tough fit, but trying the two together in series (they are 6V batteries) basically gives you one big 12V battery with 925 CCA and
492 min of reserve capacity..