Yes, I think your solar and two batteries will handle your needs. Your biggest hog is the inverter, but a 300 is not so bad as my 1500.
Lights and fans are near nothing.
I have the Danfoss fridge, just installed it so can't make claims, but looking forward to parking on a slope and powering it for free - as long as there is sun. I think it will go 3 days with overcast skies, so that is usually longer than I stay in a spot and can charge off alternator if I must.
I had (still have) a single compartment ARB danfoss fridge. The issue with one compartment is the need for both a fridge and a freezer. I upgraded to a two compartment. I cook every meal so food storage is a must, and a freezer is so nice to keep food for long periods. I got an Iceco, so I can actually turn one compartment off if not needed (such as when I have ate up my frozen goods).
I just ordered a MPPT off ebay for $50. Well see how it goes, but with this I can run the panels in series (so they dont have to all match). Running in series will get more out of the panels.
40 gallons is a lot for one. Carry a jug (the square blue one that holds 4-5 gal) so you can refil the big tank if a hose is not an option. Stay away from WI water.
I use a water filter, so have a 2 gallon jug I use to fill the filter jug, so as to not waste tank water. I can fill the 2 gallon jug anywhere anytime and is easy to fill often, even with stream water.
The biggest downside of soloing is loneliness. A dog would help, but then you have to keep up with a dog, and are stuck with a dog and he will limit your activities to dog friendly things. Its not like a house where you can just say bye and lock the door..
You seem to be set up pretty good right now, so enjoy it.