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.