Finally found the fuse!
So after a lot of looking I finally found the 30a fuse for the tongue jack. It was in the coach, under the dinette seat where the wiring comes in. Had to dismantle half of the bracing under the seat to get to it, but I won. All now is well.
Thank you all for your help!
TT 2016 X19H
TV 2016 Ford Transit 150 Wagon Ecoboost, 2013 Ford F-150 4x4 5.0