I know this is an older post, but I also noticed nobody had responded.
In my experience, most dual fridges draw about 4-6 amps when on electric.
One thing to consider is that you won't be able to keep your food cold when you're going down the road if you switch out the fridge to a residential one unless you plan on using an appropriately sized inverter and doing some fancy wiring.
A cooler might be a less expensive option.