Just for info.  When traveling and camping in 100 degree weather, we noticed that the wall inside the closet, next to the refrig. was extremely hot.  This is the forward wall in the closet towards the outside.  In the refrig. outside compartment, the closet wall is next to the chimney of the burner. The wall was borderline spontaneous combustion and really needs an air gap insulation between the burner chimney and the wall.  I am trying to figure out a way to accomplish this.
  Bob   

We agree totally.

When we left Florida in June, it was extremely hot and I became very concerned.

Once we got into Virginia it cooled down. We are now in Prince Edward Island Canada and it is still hot but not anywhere near the heat that we experienced in the South.

Would a solar powered fan help?

The solar powered fan may move more air through the outside refrig. compartment, but I do not believe it will relieve the intense heat from the chimney.  Only true solution would be to add a non-combustible material on standoffs attached to the closet wall on the refrig. compartment side.  This would provide an air gap between the closet wall and the chimney allowing air to circulate freely and taking the direct heat off of the closet wall.  At that point then a solar fan would be an asset.

Thanks for the warning.  I will pay close attention when in very hot weather.

When in-route, it is unavoidable.  But it may be wise to stay where pole electric is available, for both roof-top a/c and electric fridge opperation.