has anyone got a shock absorbing mat for 12 volt freezer??

I have an Eva Kool and they recommend a 50mm layer of foam. However the fridge won't fit in the ute tray with that thickness so I have been using 20mm High density closed cell foam from Clarke Rubber for the last 4 years, seems to work OK, fridge is still working!

You can get a set of 4 foam mats from Bunnings for $17.50. Just glue them to one another to get the thickness you want.
I have insulated one of my fridges with the stuff, including a layer underneath.

You could use an Engel sprung Transit Base.

I use high density foam under my Waeco to absorb the bumps. Makes a huge difference for absorbing vibrations, and stopping heat from coming up under the floor when driving in hot weather.

I had the Engle in a cab over truck on N QLD & NT roads in the days when they were bloody rough, it was sitting on springs, 6 springs sandwiched between 2 pieces of plywood, the bottom secured to the truck, the fridge secured to the top, it takes some doing in getting the right strength springs, the weight maybe some problem for a 4wd, but it is possible to make it lightweight.
It is just an idea, but it worked very well for many years.

Hi Chris, it was long time ago, remember it was a bit of time consuming, don’t remember were got the springs from, possible from scrap metal drum from workshop, some from an old bed is possible.

Seems to me that shock absorbing set-up is more or less asking for trouble. If this is needed to prevent/preserve the compress from jumping around then I'd suggest getting a more robust fridge.

Whats wrong with just securing it firmly, then the only thing/s that jump around is the beer inside the fridge.

Liemack recommend a 50mm thick piece of high density foam,slightly bigger than the base size of the fridge, you can have it cut at a Clark rubber but it cost me about $50 when i bought my Liemack 90litreDTV fridge back in 1999. Michael

Chris,
I use a 70Lt Reefer fridge/freezer, I sit it on a 'plastic' lattice type "bread container" I think??
It's been on there since about 1996, originally was a Liemack 50Lt F/F and found I wanted something larger.

The plastic container sits on carpet which sits over underlay, reason being you should have some 'air' space under fridge cabinet

Maîneÿ . . .