The Jobo multitank 6 will process up to 12 sheets of 4X5 (on reels) and 2 sheets of 8X10 inside the tank with no reels.
You can use it with a roller base, but doing color in an un tempered environment might be tricky (though you can figure out a way to do that).
You can also do roll film in the same tank (with another type of reel).
Its the ultimate do it all solution for LF\roll film.