I bought my towbar from Tow-equip, it turned out at the time, Ford off-loaded all their removable mk3 Mondeo bars to them and at £125 it was a gift! I also ordered a Ford loom but this was 'out of stock' or some such excuse?
Being in a hurry and buying the car in Derby, next door to Indespension, would you believe!, on Ascot Drive, the solution seemed obvious.
The guy in charge of fitting, and should have fitted it, is very knowledgeable and will answer all your doubts, in my case he recomended and used a 'standard' loom and fitted my bar for £75 all in.
Sadly it all went a bit pear shaped after that?, the 'expert' was called away and I got the apprentice!... took him 4 long hours and made a complete **** up of the bumper cut, a brand new bumper I might add!!
One thing I gleamed about the Ford loom is it's under rated as far as 12v power to the van, the pre-wired section in the car is simply not heavy enough for UK use, the loom has a gizmo to stop any over heating problems so switches off the supply to the van, problem is the fridge/charging stop working!
To clarify, the fitted 12v supply to the van is fed via wiring thinner than supplies the 10A rated 12v socket in the boot! this slightly heavier wire was the wire used in my case, albeit as yet not used, I doubt very much that's heavy enough either, just after 4hrs and the bumper cut fiasco, I'd had enough?!
Apparently it's Ford Germany that specify the wiring size and they don't have such power needs? so don't understand our needs?
So I can't answer the reverse sensor question and raised another question regarding wiring, whichever loom you use?, perhaps standard loom and insisting on a proper 25A supply direct from battery will answer that?