Yes, I'm lazy
I downloaded some maps from Steam workshop. When I play on casual mode I can't recover my trucks. I click on "recover in nearest garage", game warns me about loosing load, I click OK and nothing happens. It doesn't matter whether truck is empty or full of wood, fuel etc. I tried several maps with same result.
EDIT: this seems to be maps issue. Sorry for bothering you.
EDIT2: I guess I found it. You need to get to the garage at least once with a truck that you want to recover. (Bad idea)
EDIT3: I got a clue: when you unlock garage, recovering works fine. When garage is unlocked from the beginning: nope.