From talking with other Ford truck forums' Euro members (used to own a 7th gen, still a member on some forums), this is what they do for the rear end of the the truck.
1. Fit a generic rear red fog light and a generic rear white fog light.
2. Change out the clear bulbs in the reversing lights that come in the stock rear light clusters for amber ones.
3. Connect said amber bulbs to the turn signal wires in the trailering harness (because the stock Ford taillights don't have a separate wire for that.)
4. Connect the white fog light up as a reversing lamp as the original ones are now turn signals.