Ah, more fond memories.  ASI is still doing conversions as far as I
know, but only on American vans.  Back in the 70's Riviera Motors in
Portland, OR, was a major distributor for VW, and they contracted with
ASI to do a nice straight up pop-top camper conversion for sale through
their network of dealers.  Most people used to refer to them as Riviera
conversions.  They compared favorably with the Wesfalia camper, but
overall quality was somewhat lower.  They didn't use the European type
nine-ply plywood for example, so the interiors didn't hold up as well
(not to mention the wonderful 70's colors they used--orange, lime green,
brown plaids), but the pop-top was very high quality.

Plenty are still out there, and they are affordable.  Just plan on
recovering everything if the PO hasn't already!
--
Stuart MacMillan
Manager, Case Program
800-909-8244 ext 208

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