Allow me to elaborate. Duallies are limited to one hour, no matter what it is. Trailers are limited to one hour as well.
Class B vans if they are registered as a motorhome are limited to one hour. If you are under 20 feet, a single axle and registered as a van you can park it on the street.
This was recently changed by the Parking Authority due to "complaints". Read as "cash grab".