I noticed that the truck cargo area can be entered and furniture can be placed inside, so I tried using the truck as a mobile base.
At first everything works fine, even while driving. But after some time or after loading a save, the furniture inside starts colliding with each other when the truck moves. They get damaged and eventually disappear.
Because of this it’s very hard to transport furniture or build a mobile base inside the truck. Not sure if this is a physics bug, but I wanted to report it.