I'm not sure how to connect the car trailers up. Yes I know someone is going to say WELD IS THIS AMAZING THING... or USE ROPES DUDE. But I mean how to connect the trailers to the trucks through the add on. There is a way to connect the trailers up normally. (Like how you can just take the flatbed trailer and just drop the trailer onto the back of a truck and it just connects to the truck)