With a translucent roof, you can get this much light in your truck on the cloudiest days.
http://truckconversion.net/photopost....php?photo=872
It lets in so much free available natural lighting.
I understand the condensation problem and the lack of insulation it provides, but if you're in a mild climate, it's really nice. You could always cover it when it got cold during the eve.
Here's another shot with the rear roll up door in the up position.
http://truckconversion.net/photopost....php?photo=871
Anyone wish they could get this much natural lighting during the days and nights in their trucks?