So I realized how it took more than 24 hours for our DM2652 refer to get cold (faster on gas) while prepping for our first trip. It was initially even longer until I figured out the thermistor was set too low.
I started looking around the forum, after thinking maybe something was wrong, and discovered lots of people use / recommend the little fans inside to improve cooling. I didn't like the idea of losing shelf space, being a family of 5, we sort of need every inch. As well as I am really bad about turning things like them off and would probably require new batteries every time we camped. So I starting looking around and stumbled across this set up.
http://www.ebay.com/itm/181208057633...%3AMEBIDX%3AIT
And... well... HOLY CRAP!!! it works FANtastically (pun intended). It has cut the initial cooling time down to about 6-7 hours. It's quite small, convenient works on 12v and even has an on / off switch.
I ran the wire through the hole / grommet with the refer's light and connected it with the light's power wire at the board and the common ground. It did work as advertised with just using the clips on the cooling fins as a ground, but I figured you can never have too many grounds. This hook up allows it to operate only when the refer is on and shut off when the refer is off. Make sure to remember to D/C ALL both 110 and 12v power.