From Rigs of Rods Wiki
Welcome to the guide to Rigidity in Rigs of Rods, This guide is to making a sturdy vehicle for Rigs of Rods, by interconnecting the nodes in a "X" to create a strong chassis.
If you do not have a "X" shape interconnecting your beams, your chassis will be very Flimsy, Which in turn is bad, Right?
Preparing your chassis
Once you have completed your first beams and nodes, your chassis should be a basic chassis, that is easy to work with.
After that, you will begin the process of interconnecting the beams, which will look like this,
Just do that with the box/chassis/creation until you have it all covered.
(DO NOT use "Interconnect" in the Editorizer on large objects, it will interconnect every node to each other, which in turn will double, or even triple the reccomended amount of beams in your structure)
After you have completed that task, you should go continue on to the "Wheels" section, that is where you will learn to add wheels to your newly formed, Rigid structure!