This is a basic traffic cone I had knocking about for quite some time. You can either use a crane to move it around or place them on a terrain.
It has a low polygon count and has a very simple node and beam structure, so you should be able to spawn many before getting a large FPS drop.
It is also contactable + ropable, and is ~1m high, weighing 7kg.
Metalmuncher: Meshes, Node and Beam, Texture
Requires a recent version of Rigs of Rods: 0.38.42 +
Throw it into your packs folder in My Documents.
No need for permission to modify or use, just credit me.
Here is a Flat screen TV that you can load into the back of a pickup truck. It is contactable to vehicles that have a contactable submesh.
Included is a template to add your own image to the TV screen.
This is a pack of wooden crates. I have attempted to make them sort of high-detail and I think I have succeeded for the most part. There are many variations inside, so look at the list below. In the future I am willing to make more requests for different versions. These crates have a 'hooking point' for cranes and also have 'ropables' so you can fasten them to other vehicles. They also include a submesh so they can be contactive with other submeshes/contactive structures. They emit really good framerate because of the simply-low node/beam count. They can be used in groups without affecting your framerate heavily. There are many versions, too.
Beolex - 3D Modeling/nodes & beams/texturing
Venem - Assisting with beam color