Tanner found a set of four of these adapters, but several of us don’t recognize them (Here are some for comparison: http://www.ewillys.com/2017/04/05/dual-wheel-adapters/). They seem closest to the Hickey adapters, but also different front them. Here are the pics:
Features Research Archives
History of VIASA
JW added a comment to one of the VIASA posts, which led me to do some googling. I landed on this YouTube video that appears to do a good job sketching the history of VIASA and the vehicles.
1969 Viasa Brochure (Spain)
I just picked up this Viasa brochure from Egypt via eBay (along with some other 1 sheet brochures). Note that these rigs are all powered by the Perkins Diesel. I’ve dated this using the legal notice at the bottom of page three that ends in “1969”.
This front page is about 8.5″ x 11″ landscape oriented:
This middle section opens horizontally:
This is the back page:
4 1969? Viasa Spanish Jeep Ad Sheets
I could not find dates on these, but the models and designs look very similar to the 1969 brochure, so I can only guess these are from around 1969. Each of these models are similar to the M-series forward control designs.
The “Jeep” Campeardo is reflective of the M-676; just a basic forward control truck:
This “Jeep” Duplex has four doors and a small truck bed, similar to the M-677:
The “Jeep” Toledo is similar to the M-678:
This “Jeep” Furgon has few windows than the Toledo model above, sort of like the M-679: