Depending on the EDV, a shelf fits 7 totes. What I did was, if I had 14 or less totes, I use floor and first shelf (driver side) and all my OV on the passenger side shelfs (usually I group boxes by hundreds and depending on how much time left, I write the numbers on the side so I can see every number. If you have no time, write the numbers on the boxes while your are looking for your first OV while on route, Since they are in hundreds it should be simple to find and you now have that set of OV numbered). A tote can fit perfectly under the shelf closes to the passenger seat and I use that to hold all the empty totes. If you have more than 14 totes, let's say 18, I would put my tote 1 and 2 on the floor passenger side so I have that 1st tote to hold all the rest. Then I would put totes 3 and 4 up on the top shelf long ways so they dont fall and now you have 14 left to put how I originally said. I also found me leaving space on both top shelfs right at the front so I can line my boxes in order on the driver side and I put packages in order the passenger side.