You just need to be able to get the new fridge in the existing space or be willing to do some slight modifications of opening size. You will need an inverter and at least 2 good deep cycle batteries. Dry camping will require some solar or a small generator if you plan to stay for a few days.
Many have installed the Samsung unit (check out the Tiffin RV Forum) and it has worked successfully with MSW and TSW inverters. You may already have the necessary hardware and batteries so it's just a matter of finding if the plug behind the existing fridge has the inverter connected or what's necessary to run a new wire to that location.