I like the Jobo tanks and can vouch for the 2521 which will process 6 sheets of 4x5 and my favorite the 2551 which enables me to process up to 12 sheets of 4x5 or a combination of 4x5 and 120 roll and 35mm. I used it on a roller base until I got my CPE 2Plus.

Jobo also makes, or used to make a manual roller base for the 2521 and it worked just fine and being able to develop 6 sheets of 4x5 in 560ml of developer is very economic.

Mike