I've been thinking of a VW bus rack. They come in different sizes and you can even get ladders. The width difference of a VW micro bus and a Burb/Panel/Pickup 55/59 aint big and I think it can be easily modified to fit.
The thing is that at least the Burb/Panel roof is very prone to oil can effect, and I don't think it will take much to permanent the damage denting it with the feet of the Classic Racks if you aren't careful. Wagons roof are made to take a roof load and they often have profiles stamped in to them to make them more rigid.
The VW micro bus rack off loads it's whole load to the drip rail and I think thats a lot safer then to the roof it self.
Burbly Dyna
