Soo.. if i take a giant stone apart, into pieces ready to load and save my game and reload it, it dosen't show that the trailer is beeing filled in the trailer "filling meter", but it does show me, that the trailer is actually beeing filled, and as far as i can figure, its JUST the fill meter not working "correcty" after the load. Once you unload what you have loaded, the fill meter works as intended again :)