Thank you all for your help and ideas.
I do have an adjustment on the front of the fridge but it doesn't seem to make any difference. So looks like mine isn't supposed to have any adjustment except knob on front. Thank you very much for this info... clears up one question.
Maybe I am expecting too much. On propane, outside temp high on low to mid 70's, it will maintain 43 degrees if packed with already cold food. Any higher outside temps it can easily climb to 47 degrees. It runs a little better on AC. Freezes good on AC or propane. I have an exhaust fan but it doesn't seem to make any difference.
I am doing to contact dinosaur electronics to see it they can help. I keep reading good things about this company.
