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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 Eurovans 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.
Full size cargo vans with a 24” high top will yield about 6' 2“ of headroom when finished out.7)
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.”9)
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, called a TV top in the industry10), is a slim raised roof found on conversion vans. The raised area was installed to provide space for media and HVAC accessories. If the accessories are stripped out there is will be some additional headroom; standing room will be about 60” at the highest point.11)
If you are planning to install a rack, pay attention to how the top is mounted relative to the rain gutters. Some are inset from the gutters far enough to allow the mounting of standard tall racks.