The reason some cars are not listed is because FORD do not list a towing weight etc, had this with me cossie.
They told me it would need uprated brakes and suspension to tow, whereas a std sierra they said was better, they obviously know what a cossie is!!
Most likely just playing it safe on thier part, ie liability etc.
It may well need the bumper slot cutting, have a measure with a std mondy about bumper depth etc.