crazy idea!

[Supermario]

I was thinking of making my reefer trailer into a cooler for pop cans, and beer of course
I'd like the top of trailer to open on a small piano hinge running the length of it.
Build a inner wall out of aluminum within the box which is about 3/4"- 1" smaller dimension. Fill the gap between the two with spray foam. Then another sealed container out of stainless which could be placed in and removed easily?
Hmmm, might have to make it a tri axle trailer. This is starting to sound heavy

Mario