@sierra If you were using Linux I'd have just suggested modifying fstab to mount the big burly disk under /home instead and letting the other disks eat up other random parts of the filesystem (or maybe other parts of your own home directory?)
BSD already stores different parts of the system using different partitions anyway and it would make more sense to apply that logic to different disks, rather than doing the DOS thing and installing a bunch of junk programs to another disk or whatever like my sibling does. (1 tb C drive is full and I keep telling them to *REINSTALL WINDOWS.*)