The single most costly repair in any RV,is having the refrigerator un-level..If it is not level or very close,it is dying a slow death from the get go..
I always carry two bags of the lego levelers along with a good shovel and Polanski.With my TC,I carry the extra bag behind the seat.
Being level for the refrigerator is everything for the longevity of an RV frig.Taking shortcuts kills the frig slowly..The lego blocks are cheap if your not in a place you can shovel out spots to be level.
I have replaced three RV refrigerators that were bought used and worked when I bought them,but it is a roll of the dice on a used unit that was not kept level.