Have you tried taking the top vent cover off also? To get our trillium
4500 in the garage we have to remove the vent cover, put on an old set of bare rims, and push up the garage door so it doesn't hang down into the opening. It just fits through the garage door.
Our neighbor is able to get his tall camper van in his garage after taking off a piece of deorative trim on the top portion of his garage door opening. No such luck for us.