Finishing up my storage/sleeping platform. As I stated before, this took me a long time to design since I need it to be able to work for several types of trips. The biggest hurdle was that I needed it to fit 2 spare 37" tires, which is what I run on my prerunner and on the race truck that I chase for. Also, I really wanted everything to have its own spot and to be able to secure everything really well.
Here is how it ended up- it has 2 main sections that can be mounted independently but they bolt together. The left (driver's) side fits 2 Action Packers towards the front, and then 1 Action Packer and a 7 gallon water container towards the rear. My air compressor is mounted just in front of the water container. I am planning on making an aluminum panel that will mount on the back, hinged along the bottom- when it is folded up it will secure the Action Packer and water container, and when folded down it can function as a table for a stove while camping.
The right (pass) side fits an Action Packer or a cooler towards the front, and then has a larger section towards the rear. In "chase" mode, I can remove the top and fit 2 37" tires standing up side by side. They fit so tightly that I don't even need to tie them down. The bar across the rear has a pin release in the middle so it can be raised up to load the tires. When I am not carrying any tires, I can throw other stuff in that spot. I am still working on how to mount the wood top over that section, which obviously won't fit in place with the tires but I need for sleeping- I am hoping to figure out a way to have it fold over towards the driver's side on a hinge, but it may need to just be pulled off.
I am still working on covering the wood (3/4" MDO) with carpet. I used 3/4" because of the large area without any supports where the tires go- the 3/4 can easily support the weight of a person with no flex even in that area. The wood is bolted to tabs on the frame using 1/4" "tee" nuts going through the wood. The frame is bolted to some of the seat bracket and seat belt holes, and when everything is all bolted together it is very strong. I think I used about 80lbs of metal, and about 60lbs of wood, so it is not super light but I can easily pick up each side by myself.
After I use it for a while to make sure it is funtional I will clean it up and paint it. I also plan on adding some sort of utilitrack or tie downs along both sides for securing things on top of the platform.