I will cover how to add towing and auto refuel here since i dont see alot of other tutorials for it!
Towing:
Step 1: Download your mission.pbo
Step 2: extract the pbo using a program like http://www.armaholic.com/page.php?id=16369
Step 3: navigate to the init.sqf
Step 4: scroll down to the very bottom and insert execVM "R3F_ARTY_AND_LOG\init.sqf"
Step 5: download the towing script found here...
Towing + Auto Refuel 1.8.0.3
Towing:
Step 1: Download your mission.pbo
Step 2: extract the pbo using a program like http://www.armaholic.com/page.php?id=16369
Step 3: navigate to the init.sqf
Step 4: scroll down to the very bottom and insert execVM "R3F_ARTY_AND_LOG\init.sqf"
Step 5: download the towing script found here...
Towing + Auto Refuel 1.8.0.3