It's probably a simple solution, but I'm planning on making the jump to AG very shortly and, having only done 5-gallon batches in the past, am wondering what is the easiest way to ferment a full 15-gallon batch. I would expect most people to say "just use 3, 5-gallon carboys", and that is fine. I am curious if there another way short of purchasing a 15-gallon conical fermenter? I suppose it's simply a question of volume, but would like to know how other AG brewers do it and what kinds of setups might be involved.
The advantage (aside from price) of getting three 6 or 6.5 gallon better bottles or glass carboys would be that you can move them around without injuring yourself. I'm using two 6-gallon better bottles for the 10 gallon batch I made recently, and they're working nicely. That also lets you experiment with different kinds of yeast in the same wort, etc.