[Imp]

Cross
Its entirely upto you as a player what you think would be reasonably common.
My view is infantry weapons yes to an extent but vehicles they are probably struggling to keep there own stuff going let alone work on something they are not used to apart from basic transport like a truck.

Most players would get the hump if they bought a company of 10 tanks & only 3 showed up at the start with another couple arriving later. You could no doubt model a second movement class that has a % to breakdown for every hex entered. You know petrols nearly gone just dont know when its going to run out.
Same thing goes for ammo loads including infantry you would just micro manage keepinng an eye on by keep looking up.
Guessing here but in the heat of combat think you should just be more selective with targets. Notice ammos getting low & the next warning is a shout of last round