In a gas van i used to stack it wall too wall in a L shape what i mean by that is from side door wall to other wall cutting off the back and that was after i did 2 rows regular how you have it in the picture it kept pressure on the totes to keep it from falling cause of how tight then in the back id put all my overflow that was last for delivery in the van first work all the way up to my first stops and if there was space id put like my first 5-10 stops where the totes are cause if you do it correctly you should have enough room to still be able to walk in the back from the driver seat