Hello Captain, my friend, I have been a 'camper' for over 45 years. For you (any newby) there are many 'small' things to learn that those who have been doing this for a while really never think about and completely forget to think about. I had to stop and think if my fridge made any noise? No noise...but it works...
when you said.
I had an electrician wire it specifically for the camper
what do you mean by this? I thought that you had a new camper and it would seem that it would have came with a duel fuel (propane/electric) fridge. Did you add a second fridge that is only electric?
These small camper fridges do take 4-6 hours to cool down. Why does it take so long? Because most of the time it is empty when 'we' turn them on to cool them down. The cooling system is small, but works really well for what it is asked to do. A 'full' fridge (just like at home) will stay cold easier and faster if it is full. A day before we 'stock' the camper I will connect the batts (I disconnect them so that will not run them down from parasite usage from the safety monitors) plug the camper in and then turn the fridge on. I like to have the fridge 'on' when I am running down the road, so when we are ready to roll. I will unplug it and open the primary propane tank. The gas will take a while to force its' way to the fridge, so I turn on a stove burning to get the gas back to the fridge faster. Air will come out of the burner and I hit it with a lighter every few seconds to see if it will start. All of this time I am hearing the fridge lighter clicking away trying to ignite the propane that is not there. After several trys the fridge will default off and ask me to 'check' it. I will reset the fridge button after I get propane to the stove. Once the propane is lit on the fridge (you should hear it ignite) it will be fine as you go down the road on your trip.
Happy trails and enjoy your new camper. It may seem like a lot of work sometimes and it is, but the rewards are worth it all.