There is a lot of junk around. You need a compressor fridge to be able to keep temperature as low as needed for carrying meat, milk, cheese over days.
For a bike they seams to be too bit bulky and heavy?!
If I look to the really overlanding bikers, equiped with tent, sleepingbag, cooker, food - they seems to travel already not very lightweight.
Alpicool, 12l Fridge, 7kg, around 160$
Engel MHD13 is too made for carrying medicinal stuff, around 1000$ and weight 14kg. (my favorite brand)
It is not just the fridge, it is too the stuff you will start to cool down:

, meat, chease, butter who will bring additional weight.
So - guess it has a reason, that we dont see bikers who are travelling with a fridge..
Surfy