You are correct. Those two companies do no exist anymore.
Interesting observation about the "S" for the 3rd axle. It might be a Mack with a "genuine" Mack 3rd axle.
All those three trucks were sold by an unknown distributor in Helsingborg as far as I can read from the documents.
There are a couple of photos from said trucking companies in this archive.
Three of the pictures show one of the Macks that I mentioned.
It must be the 1952 EF from Dragarelagets Åkeri.

- B1002327.jpg (127.38 KiB) Visad 38211 gånger
http://www.landskronaminnesbanken.se/Fo ... %F6k&sok=1I have copied the link with the default search word "lastbil" (Swedish word for truck, lorry, etc.) as you can see at the bottom search box.
I have searched this archive myself a number of times, looking for my fathers trucks (Volvos, Dodge-Fargo, Scania-Vabis and Internationals between 1936 and 1969) but so far not found any of his trucks unfortunately.
I have the intention to visit the museum which is only about 30 km from where I am living now just to try to find some photos of trucks.
// Kjell N