[Konstantinos]

Currently, you have 3 positions to TruckingUnload array. In case you get more and you cannot check if a player is in range of position 1, if not, check position 2 etc. a loop would do the job for you.

PHP код:

for (new i; i != sizeof (TruckingUnload); ++i)
{
    if(IsPlayerInRangeOfPoint(playerid, 7.0, TruckingUnload[i][0], TruckingUnload[i][1], TruckingUnload[i][2]))
    {
        // in range.. "i" holds the index. For example, "i" is 2. So you're in range of the 3rd position (remember indexes start with 0)
        break;
    }
}