If the RV is "comfortably level" to sleep in, then it's probably OK for the refrigerator operation. But, if you're climbing uphill and downhill in the RV, then it's not good for the refrigerator. The problem is the anticorrosive additives in the ammonia system are a powder and if the RV isn't "somewhat level" those powders will deposit in the "uphill parts" of the return system and form crystals which will cause the liquid ammonia not to flow properly. When that happens, the reefer loses efficiency and the corrosive effects of the ammonia sitting in those "nooks and crannies" causes premature failure and leakage. It's really hard to say how long is too long to be "off level" but I'd prefer not to even find out.
The older refrigerators (60's - 80's) were extremely sensitive to "off level" operation. Now, essentially, if the RV is comfortable to sleep in, it's OK for reefer operation.
As for cooldown time, an empty refrigerator, one that was just turned on and loaded with warm contents or one that hasn't been previously cooled down can take upwards of a full day to cool down. If you must load and leave immediately after turning on the refrigerator, load it with frozen foods, cold foods and delay putting any warm sodas/beer etc until after it has cooled down completely.
Maybe using an ice chest for those things you can't precool would help ????
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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