These vehicles are MDF and plywood kits.
Instructions are included, normal PVA glue will be required.
An evenings modelling will produce fun and realistic scenic results.
Trucks can be set as tipping with load pouring out or travelling.
Photo 2 shows various configurations.  This kit has  TWO  trucks in it.
Colour to suit your favourite make/brand, the design is generic.
Great background scenery, they are not designed as feature models, and compare very well with the cast resin trucks etc, available.