For example for a 11 6 boat on a trailer you might want to go with a garage door dimensions of 12 foot high and at least 10 foot in width.
Boat garage door height.
Garage door height is a key limiting factor for most boats excluding bass boats.
If your boat is above a certain height you need a permit to tow it.
Most ocean boats say bay boats or pontoons have real issues with garage doors since they are typically tall.
To cover all possible boats that you can tow without a permit than a garage of about 14 7 feet high would cover all the bases.
Get a bigger garage.
Bass boats are generally very low profile and only power poles if applicable fishing seats and huge outboard motors ever come close to not clearly.
But do not have to put the tower down and have plenty of room to walk around and even store stuff behind the boat.
As with the garage length this will depend on the height of your pontoon and trailer considering the bimini too.