No they are not much good , they don't hold temperature ,that is why they make compressor fridges this only from a Refrigeration Mechanics point of view Bob
Hold on a moment.
Would you lift a 26kgs 12 volt compressor frig from a prime mover everynight because it may not be there in the morning. Abig no.
My lightweight cooler was billiant, my oversized lunch box but the last 4 years it just sat there between the seats of the prime and the night shift never shifted it but had it been an expensive compressor frig it would of been used in someone else's forby.
As the old saying goes, "horses for courses".
Even our though our fridge is light comparatively speaking, when one factors in the weight of the contents it gets pretty heavy & awkward. Had an issue with my back a few times & I don't want to go there again. We move the fridge twice a day as we sleep in the car in general. Fridges are a bugger to move. The reason I use 10L containers for fuel & not 20L.
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50L custom fuel rack 6x20W 100/20mppt 4x26Ah gel 28L super insulated fridge TPMS 3 ARB compressors heatsink fan cooled 4L tank aftercooler Air/water OCD cleaning 4 stage car acoustic insulation.