Absorption cooling (RV FRIDGE) is very effective, and depending on the quality of the cooling unit very reliable and safe (leaks are not safe).
BUT.. Not very efficient. About 300-400 watts running
Compressor units are more efficient About 100-150 for an RV size running
And the new High Efficiency Compressor units 35-40 watts running.
NOTE these high effiency jobs are or were offered by both Norcold and Dometic in the standard RV size(s) and are electric (120/12v) only
I also have a Freezer (Chest type) behind me. Same technology 36 watts 13 years old.. Only problems I've had with it are in teh 12 volt supply.. It sometimes comes unplugged. so now every time I move.. I check it.