wdk450, we had a three way refer in our tent camper. 12 volt worked really well when traveling. However, the last time I checked on a larger size refer like the ones that come in our fifth wheels they were
a little more costly. So I guess that with all the neet things we would like manufacturers to put in our coaches, I think the cost would skyrocket. And I have to add my nickles worth on the debate, we have traveled up to 8 hours in hot weather and have had no problems with anything getting too warm. And if you really want to run on 12 volts, get an inverter for the refer.
Peace
Dave