This thread is a few months old, but I thought some of you may find this of interest...
I've recently completed restoring a 1969 Trailswest Campster
. The new owners requested that I install an "Avanti AC/DC Superconductor" refrigerator
. About $150.00 at Amazon.com. I guess they intend on staying at campgrounds that provide hook-ups.
The AC (120V) simply plugs into a standard receptacle; DC uses a 20amp torpedo-plug that's inserted into a CLA (cigarette lighter adapter). I customized the installation to accommodate the frig, and "re-engineered" and hard-wired the connections so that I could control the energy source with a couple simple switches. A simple gate hook keeps the door from opening during transit.