Here is what I have done.
The box on the right is a copy of one my dad built out of plans in a Sunset Magazine in the 50's, called a Stampede Box. It has two drawers for small items and utensils. I have used that for about 20 years. My sister built it for me and gave it to me for Christmas. It has served me well, but... I have an Aerocover bed cover and it has to be laid on its back to travel.
I decided I wanted to redesign the concept to be horizontal in format and to fit under my cover. I wanted it a little larger to carry pots and larger pans like my cast iron skillet, and my stovetop griddle. I use it off the tailgate mainly.
The drawers are a little larger too, to hold the bigger utensils like spatulas and wooden spoons. After many years of basic camping, mainly out of a can, or simple meals, I have decided I want to eat well and enjoy. Yes, it's more work, but it is more satisfying.
I am not a great woodworker, so there are flaws, but it served well on my recent trip to southern Utah. The paint was barely dry before we left and it still needs a few finishing touches.
The old one is 12W x 24H x 12D. The new one is 31W x 14H x 15D.