Ben, The refrigerators in TT take a long time to come to temperature. It is best if you can turn your unit on at least 24 hours before you,are ready to go camping. If you can't plug in shore power then you can cool it with propane. You need charged 12 v batteries. I don't know what model your fridge is but most have an 3 function switches. Off, auto or gas. When in auto it will automatically switch between gas and 120v. I leave mine in that mode until I come home and turn it off. Make sure when you turn it off that you use the blue attachments that keep the doors open so mold does not grow in the fridge.
Now, when the unit gets cold ( freezer will freeze first, then fridge will cool down) make sure the food you put in is already a cool temp or frozen if going into the freezer. These units do not do well when you load them up with room temp stuff or unfrozen food. Don't overload the units. They are not your fridge in your home. Go to the camper store and buy a thermometer for your freezer and your fridge so you can monitor the temps
Enjoy your new camper...
2016 Siverback 33IK
2015 Ford F-250 Lariat 6.7L V8 Diesel 4WD Super Cab
"If you don't know where you are going, any road will get you there."