Only one of them made: the Holtkamper Mini Maxi fold-out caravan. The prototype, made at a social workshop in Hoogeveen, had the narrow width of a folding trailer of 165 cm, making caravan mirrors unnecessary. Once unfolded, it grew to 258 cm wide, surprisingly spacious for such a compact concept.
At its presentation at Caravan RAI, the price proved too high and it was decided not to put it into production. The prototype eventually ended up with the Oosterhof family in Zeewolde, who camped with it for more than twenty years. Later, the Mini Maxi was bought back by Mr. Holtkamp.
