I own 70 acres with a 30 foot construction trailer on it. It has electric, range, full sized fridge, outhouse, outside tented area with wood stove, and thousands of acres of national forest within a short walk. The driveway is 4 miles from the blacktop road.
Living back in there full time is not impossible, but it isn't easy either. You would have to grow about a half acre garden, hunt, fish, trap, and still you have to produce an income to cover the electric, taxes, and to pay for the things you can not make or grow.
I just returned from a ten day stay, where I never left that area during the ten days. The mast crop is a total failure this year, and the only plentiful food sources this year, are hickories and walnuts. Gathering enough hickory nuts, and preserving the nuts or processing for the oils, would be easy this year, but since the mast crop failed, even squirrels would be hard to come by right now.
The animal population has dropped to the point where our garbage from the first day, was still there on the 11th. A deer carcass laid for a full week without being messed with. It would be a hard place to winter this year at a subsistence level.
I have spent extensive periods of time living hunter gatherer, and I was good at it, albeit with a modern air rifle as my hunting weapon.
One lesson needs be learned from the beginning.
I went out a day before season, to get in the creek looking for good stone, or artifacts. I was picking up likely looking pieces and striking a couple of flakes off to see what they were. I rapidly recognized that most of the likely pieces, all had a couple of flakes already knocked off of them. Almost every single one. Some of it is likely natural, but more than one person had been up that creek looking for stone, and some of the scars were so old, they had the same patina as the rest of the stone. I found one block that appeared to have been used as a core to drive blades off of. Where ever it is, someone has tried to live there in a primitive or off grid manner, and did so, for a very long time period. It can be done, but it depends on what you require.
I do not require company, and I am quite happy to live that way for long periods, or was. Then we reach the really hard part. I am now old enough that most of those activities hurt. I am already older than the life expectancy of someone living that lifestyle. The older you get, the harder it gets, and the more it hurts. This should be a prime consideration from the beginning.