A way to avoid the hassle of dealing with heating units in 2 or 3 way fridges being level or not, replace it with a household unit.
96 HR Dometic went out, cost to replace cooling system $1400, replace 3 way unit, $1800. Replace with apartment size household which by the way has larger cu ft. than 3 way and the same outside dementions, $320 at HD..
When not traveling, on shore power, while traveling it's off until noon when I start the genset for an hour for lunch. Check temp, 8am 36 degrees, noon when I start genset, 41 degrees. Freezer never gets over 5 above.
At that cost difference I can replace the fridge 5-6 times if needed before I surpass the 3 way cost of one.
A lot of people are doing this with great success, a lot of people don't like it. But there is an alternative.
Steve B. Oconee County, GA
Traveling in a work in progress (aka Priscilla)
'96 HR Endeavor LE, 35' DP, Cummins 5.9, Allison 6