I keep reading here and there that the Dometic RM 182 B fridge
needs to be "level" when running....

Sooo...  what does "level" mean?  How many degrees off
level is acceptable?
What bad things happen if it's not level enough?

I'd like to be able to run the fridge overnight before the beginning
of a trip, but my driveway has a pretty good slope to it and I don't
know if i need to worry about it.
Any comments?

Thanks,
Steve