Looking for inexpensive upgrade for bunk mattresses....

Mike, Our last RV was a bunk 5'er and like your's, the bunk mattresses were junk. We went to the Original Mattress Factory over on Glenwood Ave and had them make me one to my measurements. It was basically a better and thicker foam mattress covered in the same fabric that home mattresses are covered with. We took the two that came with the trailer and stacked them. I know that wouldn't work for your situation since you have two different size bunks...