I am thinking of getting an Engel 45 or a 60 and was wondering what if any considerations are there for mounting a fridge in a rig. Is it best to mount them to the side? How much room do you need to leave around them? Is there anything else I have not thought of? If I get the 60 it will only be able to mount in the FJ60, but will I regret later not having the extra room? I have found a deal that will make the 60 only $150 more than the 45. Thanks.