Roller transport. Film goes over and under a serioer rollers and thru the solutions, then wash and dry. Comonly done for Color C41 today. Works for black and white also.
You can load 4 reels and put them on a lift rod and develope in a 4x5 deep tank. Spin during immersion and retrieval, tilt 30 deg to drain while out. I can use the same developer I use for 4x5 film on hangars. Gallon tanks can take more.
Home process 4 films a month, closed tank and timer is the best way so long as you don`t try any fancy agitations schemes touted on the internet. Just follow the instructions on Kodak website, publication J78.