Ideally you want a tank that doesn't have tapered sides and maintains a uniform diameter along its length, so that it will not be crooked when laid on its side. Any set of rollers will do, really, though a system that does both forward and reverse agitation is best, I think. I know my jobo does something like a revolution and a half in one direction, and then reverses it. I can imagine stainless steel reels and tanks working very well, due to their ease of acquisition and their straight profiles. some tape around the lip of the lid to reduce any possibility of leaking and you're off to the races.