Actually all crates of supplies can be carried in your pack. There is a trick or flaw in the game. Stand on top of the crate and then simply move it into your carry items inventory. This works trust me it's the only way I ever delivered supplies. Taking trucks gets your ass blown up.
Although while I like grenade launchers too. I can't see how they would trump a bullet to the head, unless a direct hit. You can heal wounded in the field sometimes it takes a week or so, but yeah the air in Poland must be magical. I always made zombie troops that where made to take a lot of hits, so I did this a lot. "Retreat" "never", Why? Because we are damn near inmortal. The game sucked, and the only reason I played it was because it was Twighlight 2000. I can't believe I payed 60 dollars for that p.o.s. when it first came out in the early 90's. Good thing my dad copied it to his computer so I could take it back and get my money back also.
