Tankering ???
Sorry for the drift, but.
Unless Tankering is reqd for a good reasons(not just cost of fuel) it's a dead loss for planet green and safety.
Aircraft operating at higher weights than reqd don't just use more fuel, it's all the other bits, the only good point that comes to mind is holding/diversion options can be more flex.
I hear of some airlines tankering on very long sectors to max weights allowed, crazy.
Not forgetting a big trap, tankering where you hope no fuel will be uplifted at subject airport and being just a little short on the next flight for various reasons, this can make for a flight to remember.
Safe flying to all.....