Carvin a danfoss just refers to the type of compressor that is used. I bought my fridge from nova kool. They have a wide selection.
Yes you need 2 batteries instead of one. I also have 200 watts of solar. I always have a genny with me. Mine uses about 60 watts when running. Basically it is just like your home fridge and needs no leveling in fact will run just fine when you are way out of level. I enjoyed the project of installing mine and the solar. The fridge is great.
Propane would be great if it worked out of level and in extreme heat. Definitely handy to run a fridge for month on a 5 gallon tank of propane.
For me I will always have a compressor type fridge in the future.
The Nova Kool fridges are made in lot of sizes that match to rv fridges size specs. So replacement is not difficult.