For transporting loose bulk agrarian products Butter uses hopper trailers. These trailers were specially developed for this type of transport. The loading platform is insulated, so that journeys can be made even in very low temperatures. The loading space is also equipped with two fall breakers, so that damage to the product during loading and unloading is limited to the minimum.

Until 2004 these trailers were purchased from different coachbuilders. In the meantime the people at Butter were working behind the scenes on the development of Butter’s own hopper car. This led to a revolutionary design called W concept, of which the prototype first hit the road on 1 April 2005. This new trailer has a number of advantages. Firstly, the trailer was built completely in-house. For this a production area was created in a hall in Dronten. This lessens dependence on third parties, while the utilization of the workplace has increased.
Secondly the trailer is equipped with an anti-theft device. The trailer can only be used with a Butter truck. The newly- developed lightweight support legs are operated electro-pneumatically. These legs can only be operated when the trailer is coupled to a Butter truck. The big advantage is that trailers cannot be “borrowed” just like that by transport colleagues, which currently happens regularly at factories.
The third and biggest advantage of this W-concept is the weight. The weight of the trailers themselves is only 5,000 kilos.
With regard to conventional lightweight trailers this is a saving in weight of 1,500 kilos per trailer, which increases the load capacity by 1,500 kilos.
The W-concept trailer bears two patents, both on the construction (W-concept) and the support legs.