Cooper, I'm a bit late to this party, but here you go.... Don't buy that generator. It is too damn big.
Yeah, we live in a "bigger is better" sort of society. The problem with a big generator is that they are fuel hungry. It doesn't matter if its gasoline, diesel, propane or NG, big engines use a lot of fuel. And the problem quickly becomes "I cannot keep this running!"...
I've used everything from little 2000W inverter generators, thru 4000W portables and a bigger commercial grade 5500W Honda unit. The big units amaze me: I fire up the one at work, and simply run it once every couple of weeks for an hour or two. It is ALWAYS empty!!! I do not know its fuel consumption specs, but the big units are thirsty pigs... Look online, and you usually can find a fuel consumption guideline... A lot of units in the 7500W range are going to burn through well north of 20 gallons of gasoline in 24 hours..
Do not run an engine that big if you do not need to! There is zero need to run a freezer 24 hours continuously. Plug it in, run it for 40 minutes to cool the interior, then shut it off. Leave it closed. A refrigerator can be run the same way. With switching you can keep the home fires burning, and do so with a smaller 2000, 3000W generator that will only need 4 or 5 gallons for 24 hours.... You can get by with a smaller fuel storage requirement.
You've got natural gas. Fantastic. The issue is still fuel. Look carefully at fuel consumption. Even on NG, your fuel bill for a big engine is going to shock you.