Hi, I'll give brief explanation to 8 and 10.
8 - Wear and tear, what I mean by this is that when vehicles operate in certain terrains, and conditions for a period of time. They become more prone to part wearing out, sudden mechanical failures, etc.
Taking into account the fact that armored vehicles are combat vehicles, it is certain they take damage during combat, I want to see an in depth system that focuses on realistic wear and tear. Ranging from small problems to major issues.
These could include:
Electrical problems, oil leaks, fires, parts breakage, engine seizing etc.
And much worse damage can be caused by being attacked, but this systems should also include a repair side to it. I can't say how sick i am of having a split second repair of vehicles, i want it to take time.
10 - Upgrades. What I mean by this is to be able to take a basic tank, lets take a Challenger 2 for example, a basic version... no armor upgrades, no RWS or anti IED systems.
Then just like you have on a infantry, you have 3 maybe four slots. 1 for an armor package, 1 for a weapon choice either MG or RWS and another for Defense systems such as an anti IED system and a 4th slot for a camouflage that reduces the thermal signature of a vehicle.
I hope this helps.