are decks like parking garages?
when we lived in California we opted for placards b/c we could use them for either car we owned or if we traveled and rented a car. in Washington State each qualified person can have both a license plate AND a placard so the DOL (same as DMV) is not burdened with requests for temporary placards by holders of long term (we also get 5 years per renewal vs. 2 years in CA on a permanant disability).
I will say though that i've seen dirty looks and heard rude comments thrown at law abiding non disabled people who were driving vehicles that have disabled license plates for other household members. when they follow the law and DONT park in a designated spot-if that non designated spot is close to the door and there are empty disabled spots available people can get very verbally nasty
I cautioned my oldest when we sold him our car and we had to wait for the license plates to arrive that he would do best to park a bit further away from entrys to avoid confrontations.