Vehicles almost completely hide the cargo and pawns within

[ZzZombo]

Describe the bug
This is a general problem with the mod and has such implications as:

• When forming a new caravan, the items already loaded into vehicles are not available to manage in the dialog. When out on the world map this starts to work as expected.
• Pawns inside vehicles do not get tended #268 (?): no tending occurs within vehicles.
• If I'm not mistaken vanilla caravans allow them to socialize with each other.
• Materials/ingredients are not available for use in bills/construction and so on. Tending is a pain in the ass. See also "Use Bedrolls" support #265. Note that while the linked issue is about resting on the go, it also doesn't work when on a map. Other mods in the spirit of "Use Bedroll" like "Smart Medicine" also suffer from not being able to use packed things within vehicle's cargo.
• When forming a caravan, the carrying capacity of the pawns outside vehicles is tallied for the total caravan cargo capacity, but if assigned to a vehicle subsequently, this obscures them from the calculation, in certain cases leading to an immobile caravan even though just moments ago you even had some room. Note I think that it should stay like that because that's realistic not having the pawns inside to contribute to the cargo capacity of the caravan, but the dialog should recalculate and reflect that in real time and not only do so after the pawns get placed inside a vehicle and thus no longer being visible to the game.