Hey, these are only suggestions.
So the other day i found a car tent in novaya petrovka and i couldn't place it inside my truck.
i think you should be able to do that so you can actually move it to your camp. correct me if im wrong but there is no containers in the game (beside wearing them) that can hold a car tent.
So you can only carry 1 tire with trucks, that is not either realistic or good. you should be able to carry more than 1 tires with truck.
jerry cans(gasoline cans) are oversized too. they take a lot of inventory on your truck that you can't carrys those when your going to a trip.