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A high roof installed in a van can increase headroom or even make standing possible. Adding a high roof can be an expensive process but owners generally feel it to be a worthwhile investment.
An increase in frontal area can have a negative impact on MPG. An increase in sail area can make the van more susceptible to sidewinds. An increase in exterior height will reduce clearance in drive-throughs, wooded areas, etc.
These vans can be ordered with a factory high roof:
The most common roof alteration for American vans is the fiberglass raised roof. The roof can be shipped or installed at the roof forming factory; buying a new fiberglass roof and installing it will cost $2000-$4000.
Vendors/Manufacturers:
Some used ice cream and wheelchair conversion vans will have the roof raised already.
It may also be possible to source a high roof from a junkyard. Steamjam1 notes that “Dodge van roofs never changed from 1971 all the way to 2003, [except] for minor details like third brake light holes.”7)
Pop top roofs are canvas-sided extensions that raise on both ends or only one end, as with the prototypical Westphalia camper.
A turtle top is a slim raised roof found on conversion vans. The raised area provides space for media and HVAC accessories but does not provide significant headroom compared to a passenger van. If the accessories are stripped out there is will be some additional headroom.