Relax, you're not living in there. Take it slow. Complete fridge costs $1300 in Camping World. Might find cheaper elsewhere. Plus labor. Cooling unit alone ~$900 on Amazon - again, might find cheaper, I didn't look.
Replacing it with a residential fridge? Sure... if it fits, and if you're always on grid power or ready to run a generator all day. Still several hundred bucks and some labor to remove the old one and install residential - IF your camping style even allows for residential.