Jordy,
The TRC (BA abrev for turn around coordinator) is who oversees the safe and time turn around of a flight. He essentially owns the aircraft while it is on the ground, ensure the companies policies are adhered while all ground activities are carried out. The person fulfilling this role should idealy be some someone with a load control background. However this is no longer the case due to airlines cutting back on cost. For some companies, the TRC still performs the weight and balance function and therefore is very much involved in the loading process as he/she would have known how they trimmed the flight and can better make judgement calls in the event that load needs to be relocated to accomodate the ideal trim situation of the aircraft (you would see this on transit flights). In terms of the paper work they would hand to the pilots, includes but is not limited to the flight plan that comes in from the company dispatch center, weather, the checked loadsheet (if a hard copy is generated on station to hand to the crew as some systems allows everything to be sent directly to the acars printer) and in some cases even a copy of a signed loading instructions.
PM me if you need more.
Jonathan