I have operated to CatIIIa with no rollout guidence (B737-300/700 specifically-the CatIIa options don't even have a rudder channel)
That's aircraft's feature Wiz, we're talking bout ILS CAT III ground facility.
ILS CAT III ground facility does provide rollout guidance otherwise NO DH OPS would't be allowed on it. Yet it's common all over US to fly CAT III A with NO DH.
Though in theory a it can have no DH never seen a CatIIIa operation with a DH less than 50',
Well, check out the definition of CAT III A.
