In my Starflyte B+ I had to replace the cooling element in the refrig. It turned out that installing a new frig was cheaper by $1000. ????
I had it for 4 years didn't worry about getting close to level. apparently the older design had less slope on the copper tubing that makes a repeating Z shape. If the hydrogen or ammonia can't move then you get a problem in the tubing that backs up the exchanger and burns it out....or so they told me. Had to replace it, it started not cooling.
I have always gotten near level with the Trail Lite.