The problem with a residential fridge is that you limit yourself to CGs with power. No going to various festivals where very often power sites are are limited or not available at all.
Running a generator all the time is not an option. A residential fridge needs an inverter. An inverter needs a decent sized battery bank. A decent sized battery bank needs room & is going to be heavy.
Typically RV builders allow room for only 2 X 6V batterys. This capacity is fine for running TVs, chargers & the occasional coffee maker. It is not enough for all that stuff plus a residential fridge for any length of time.
The only way to get around the problem, costing even more money, is to install non gassing batteries somewhere inside.