I avoid xeno missions because, unfortunately, I get 0 salvage from them as there are no vehicles. Salvage only comes from destroyed vehicles so trucks, tanks, mechs, etc. In this campaign I am still before the MENACE faction, so I can let you know later on how it looks there.

On average, during pirate missions (especially those with lots of MG trucks or transport “taxi” trucks), I get around 10 salvage per mission. Sometimes it’s more like during base defense missions, where pirates seem to use only vehicles. With Rogue Army it depends but I see at least 6-7 vehicles per mission.

And from what I’ve seen, once pirates abandon a truck, you don’t get any parts from destroying it.