ACE 2 questions Options

[SpetS]

Hello, I new playing this mod ACE2 and i have many questions, first I cant find any tutorial or manual about this game mod. Questions are:

1) When you are enginner and you have a truck to load and unload static weapons, how do you recharge the ammo on those weapons?
2) how do you aim with the mortar? not the artillery mode, but, close target mode, all I can see is just the sky o.O
3) Is there a shortcut key to switch weapons from back to hand? instead open Gear/inventory click "on hand"
4) and finally is someone knows a complete guide for ACE2 will be apreciate

and last, sry for my english. thanks!