[ItsRobinson]

Try something like this

PHP код:

stock SaveTrailers(trailerID) {
    new
        sz_Entry[128],
        File: fileHandle = fopen("trailers.txt", io_append),
        Float:tmpCoords[3];
    new trailerModel = GetVehicleModel(trailerID);
    GetVehiclePos(trailerID, tmpCoords[0], tmpCoords[1], tmpCoords[2]);
    format(sz_Entry, sizeof(sz_Entry), "CreateVehicle(%d, %f, %f, %f, 0, -1, -1, 6000000);", trailerModel, tmpCoords[0], tmpCoords[1], tmpCoords[2]);
    fwrite(fileHandle, sz_Entry);
    return fclose(fileHandle);
} 


PHP код:

CMD:printtrailer(playerid, params[])
{
    SaveTrailers(GetPlayerVehicleID(playerid));
    SendClientMessageToAll(-1, "Saved this Trailer");
    return 1;
} 


Not tested it, but it should work.