They just need to make the tires last longer and take less damage from minor impacts. Making them expensive is fine if they wear out slowly, it would perfect as a mid game expense but crushing if you have to replace them early.
And yeah atv definitely needs an alternator for real. Could be an item that wears out and needs semi regular replacement as well, until you get the solar panel upgrade maybe idk.
I'm sure all of this stuff will be adjusted anyway since this is a super early build.