Hello, I found a solution, I rentre a server, I go for standard setting with Sinaï Desert conquest and nuit de nivelle conquest, I spawn in a tank in Sinaï then I use admin server to change map to Nivelle, last loadout was the tanker.
I'm now in the deploy screen on Nivelle, I overlay the Cavalry icon a bug make the Calvalry load the Tanker gadgets make sûre to have Repair tool and AntiTank grenade. Now back on the Tanker icon I got my Tanker tools back.
( but I have the cavalry still not have mêlée weapon... Another bug)