Problems with Trailer on a Truck

I am working on a game with a truck, I have the cab part but once I moved on to the trailer nothing seemed to work. I tried hinges going from the truck to the trailer however when I do this the truck gets really jumpy and glitchy.

If you want to check out the truck and chassis it’s here: Truck Simulator 24-1-21.rbxl (280.3 KB)

I hope I can get some help with adding the trailer.
Thanks ICrann