I thought it would be a great idea to add vehicle tie downs to the game. Currently with the flat bad on the D series truck and the Van you can put a vehicle on it. Also, I am using a trailer pack that has a flat bed with ramps on it. It's great we can haul vehicles, however even with the parking brake on, the vehicles move while on the flatbed/trailer. I think it would be great to have a way to tie them down and keep them from moving around when towing/hauling.
Realistic way: Drive slower Arcade way: You can use node grabber. You should choose a good node to attach to the bed. Don't attach more than 4 nodes to each other. How to use node grabber? Press Left Ctrl then move your mouse. Then you'll see some points. Select one of them with left click. Then grab it to another node. Then press this key: Then the nodes will attach to each other automatically. You should choose the best nodes for it. That node should be a very strong node. For example, you can attach 2 of the chassis nodes to the bed. A node of left side of the chassis and a node of right side of the chassis