Unsolved Anchor nodes and preset position?

Just a random little question I have. Is there a way to:

a. Anchor a group of nodes to the world, so that they are static and cannot be moved. Basically nodes with an infinite mass I suppose, but no gravity.

b. Is there a way to make sure that the 'vehicle' always spawn in a pre-set location.

This could be used for making, for example a rope bridge. Thanks

 

I don't know if it is possible way you are thinking, but you might want to examine how this map's bridge is made:
https://www.beamng.com/resources/sadler-gorge.3349/

 

For the "anchored" nodes, see the 'fixed' argument here:
https://wiki.beamng.com/Nodes#Arguments