Small refrigator while traveling

When I have a need for my dorm fridge, I plug it in the day before inside our camper the same time I turn on the RV fridge. I also put 6-pack of sodas in it. The day we are ready to pull out I put a gallon jug of ice in the dorm fridge along with anything I can't fit in the RV fridge. When we get to the campground everything is nice and cold and the fridge starts back when the camper is plugged in.

We have one of the 2.7 CF dorm type. It resides in one of the basement compartments. It doesn't run while in transit. I put a couple of 1.25 bottles of water (frozen of course) in the freezer compartment to help keep it cold while we are travelling. We rarely travel more than 5 hours in a day. So far, it has always kept the contents cold.

Ok thanks everyone. I have a small generator (Honda). I think I have a power inverter. I can get it cold & sit inside my 5th wheel. Thanks!

We travel with a 3cf 120vt freezer it can go 24 hrs with out power.

I have a 1.6 cuft cube fridge in my wood shop, I just checked sticker on it
115 volt 1.3 amps
so for a small cube a 300 watt inverter should handle it easily.

I have the same sized/rated fridge in my trailer. A 600W Samlex inverter would not overcome the startup draw of the compressor. I now have a 1000W inverter and it runs flawlessly. It operates on 80w when running and at 80f, it has a 1/4 runtime (depends on number of door openings).
I operate the inverter with a single 235W solar panel and 300AH of battery capacity.
For the OP, operating the fridge with an inverter is the best but they will hold food cold for a few hours without power. If he wished to stretch the time until powered back on, he could encase the fridge body with foam board.

just sit a small gen in the bed of the truck.

When my MH fridge went out I picked up one of those small apt fridges to tide me over till I got it fixed.

Just plugged it into an outlet in the RV. I was full timing so when I got it, I just plugged my MH into shore power at a CG overnight to get it up to cold. Put food in and hit the road.

You could just plug the RV in while at home to get it cold before you leave.

Unless you plan on traveling 18 hours to your destination that little fridge 'will' keep your food cold not plugged in until you reach your destination. I used to travel 4 to 5 hours between CG's and it kept the food cold unplugged.

Problem with those dorm fridges is all the ones I've seen are 120 volt, meaning you would need an inverter (as noted above) and ample battery capacity. Certainly can be done.

I checked some truckers websites and apparently they are using 1500 watt inverters for small reefers in their rigs.
The postings seem to follow that the 3.7 to 4.5 cuft units are around 1200 watts to start and 600 to 800 when running. And remember if you get the unit cold at home on shore power and only switch to the inverter when on the road , it will only be running less than half the time.
I know I have run my 22 cuft side by side at home for a couple hours off an inverter when we had a power failure a couple of winters ago.
Be careful to only run it when the vehicle is running or you will rapidly deplete your battery.
I have a 1.6 cuft cube fridge in my wood shop, I just checked sticker on it
115 volt 1.3 amps
so for a small cube a 300 watt inverter should handle it easily.

Tried one years ago but they did not keep cold enough. Looking to plug refrig in at campground once we arrive.