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Here's the skinny on gas absorbtion fridges ... the mixture inside the tubes is liquid ammonia, hydrogen gas, and sodium chromate (a rust inhibitor used to line the internal tubing to protect it from the corrosiveness of the ammonia). Going down the road doesn't effect the fridge much because you're fiver is always moving up and down side to side sloshing the mixture about. Being quite unlevel in static conditions causes the mixture in the zig zag of tubing to slow down or just sit because it can't flow correctly. When the sodium chromate overheats, it forms small crystals. It doesn't happen in an instant, but after a while, these crystals begin to block natural pinched down areas in the tubing causing the fridge to be less and less functional. The overheated mixture also contributes to cracked welds which you can witness by the tell tale yellow stain of death on the back of your fridge coils. So ... for those that choose not to be within say 2 degrees of level (my personal figure not from a manual) you've had good luck over the years, but I'd bet your fridge doesn't perform as new whether you've realized it or not over time. I don't have an answer to the OP ... just telling what will happen over time.
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