It depends on the gun. If it had pneumatic wheels (and usually a modern brake system fitted) it was 'usually' towed. If it still had the old wooden spoked wheels (as in the photo) then it had to be towed quite slowly in vehicle terms; the 'portee' method allowed better mobility. It wasn't just a French phenomenon, although they probably pioneered the method (and gave it its name) back in the '20s, or something like that.
I would guess from Lou's list that only the battery with P107s had guns with pneumatic wheels.
no, in fact some portee guns had pneumatic wheels , but it was local modification, using Armoured cars wheels and only with locally modified trucks with wich the gun can be fired portee :
those White 75mm portee where produced to add a little firepower to the AC units ... ( the number produced is unclear but there are some accounts who speak of those trucks )
you can have wooden wheels 75mm and 105mm in motorized units , the gun been carried on a "train rouleur"