The "Predom" design is Polish, and the company is Niewiadow, but that Dutch distributor (Predom) is the site usually linked. Some were actually sold in North America, built (or just finished) in Canada by Nical but with more North American equipment... these versions were called the "Cadet", "Captain" and "Admiral" (in increasing order of size from 13' to 21' in length ).
Mini-Caravan (a website in English)
Niewiadow (official website)
By the way, a translation guide... these all mean the same thing:
Euro: "polyester"
UK: "GRP" or "glass reinforced plastic" or "glass-fibre reinforced plastic"
North America: "FRP" or "fiberglass reinforced plastic" or just "fiberglass"