I have several
BF trays to hold my guard army, including the standard sized trays for my Chimera and Russes, and I store all of them in the trays with turrets on. Some of my Russ tanks, I have to turn the turret into the "stowed for transport position" which is, the barrel pointing straight to the rear, over the engine of the vehicle
I should also point out that I have modeled all of my tanks with the hatch down (I hate anyone riding in the cupola, getting fresh air as it were... this is
WAR afterall!)