I know in the past there has been discussions on wether Ace Line Haulers are compatable with Cannon Downriggers. I e-mailed them and this was there reply:

ACE LINEHAULER

Different types of Linehaulers that we manufacture.

1. Standard Scotty Downrigger compatible linehauler with old plug
Note: This hauler fits all standard Scotty Electrical Downriggers pre 2007 with original hella type plug.

2. Standard Scotty Downrigger compatible linehauler with new plug.
Note: This hauler fits all standard Scotty Electrical Downriggers from 2007 with new style marinco plug.

Note: Ace Linehauler is not compatible with manual Scotty Downriggers

3. Cannon Big Body compatible linehauler.
Note: This hauler fits all big body mount cannon downriggers including mag 10, mag 15, mag 20, digi troll IV.

4. Cannon Tab Lock compatible linehauler.
Note: This hauler fits all easi troll 1 & 2, mini mag and sport troll.

I hope this clears things up