On the market there are mass products that can be bought at ebay or amazon or in a building center.
E.g. i found a double roll for funiture on ebay. It is a mass product at the hight of 71mm or a palette.
It would be usefull for me to find these mass products in the Warehouse.
There is a pretty wide assortment of hardware and furniture models in the 3D warehouse, though you sometimes have to phrase your search carefully to find what you want. But be warned: many of these models are way too detailed to be practical as a small part of a SketchUp model! Always download to a separate file and examine them in model info to see whether they have an acceptable number of edges and faces.