You can write your topic however you want, but you need to answer these questions:
What do you want to achieve? Keep it simple and clear!
I want my pickup-truck to be able to carry stuff with it, without anything lagging behind.
What is the issue? Include screenshots / videos if possible!
The boxes lag behind, sometimes they even clip out of the truck
What solutions have you tried so far? Did you look for solutions on the Developer Hub?
I’ve already tried to set the network-ownership of the boxes in the back, but this doesn’t work.
I know it is possible, because in “Lumber Tycoon 2” it works flawlessly
You might consider welding whatever is inside the truck’s bed to the truck when it is being driven. From there you could add things like force limits to break the welds if the truck crashes.