Ive looked at your wiki and cant seem to find anything relating to it.. but how is liquid / items unloaded from the truck other than by hand? is there a way to connect something to the car to facilitate unloading cargo? If not it would be a nice addition.. a port on the truck bed that say an importer (Refined Storage) could connect to

That's not how it works.

You can only interact with it per hand.
Unfortunately refined storage can't connect to the car, since it is an entity.

any way to have the container in the back of the truck act like a chest...it already has the storage properties of a chest... so if the car was an "entity" thats CARRYING a chest... then could not the container be interacted with much like a chest is?