I was just thinking, why don’t let the tanks which we borrow from friends to gain some exp. This can be very fair. For example from each battle these tanks will get 20-30% of it.
Btw. sorry for my english, this is not my first language.
Interesting suggestion – doing something like this will take a bit of thinking about how to fairly design it. There’s always the potential problem of power leveling if a high level player takes a newbie’s tank into a battle.