So I am painting an Ultramarine army taken mostly from the second company (standard gold trimming) my problem is that I'm not sure about the crew for my various Rhino crews. My thought would be the trim from a reserve company (the company would also be used if I added bike squads or land speeders) however I am not sure if this fits with the fluff, do the Rhino/Razorback/Landraider crews come from the company they are transporting or from a reserve company?