Have you considered a Honda trail 90 or CT 70? My grandfather and grandmother rode a single ct70 all l Er the woods of bc picking berries and hunting. They weigh a little over 100 lbs and can fold up and go in the trunk of your car. Parts are readily available and the bikes are incredibly durable.
There are a number of great Japanese bikes that are out there that will blow the pants off those mini bikes for durability and rideability even going back to 80s bikes.
This year, if I manage to register it, I'll be using my Honda fat cat 200. If I can't make it on that bike I should be bringing climbing gear.
I've owned 6 CT70 mini bikes and still own 3 (in various states of disrepair). Every one of them weighs at least 140 lbs, and none of them fold up into the trunk of a car.
Having said that, they do work great as a hunting bike, in my experience. As long as you have a sled or cart waiting back at the truck that you can attach to the bike to drag out a deer. I shot and recovered 3 deer with one of my CT70s. And a strong guy can get one into a half-ton without a ramp, no prob. Pop the front wheel on the tailgate, grab the rear fender with a gloved hand, and lift the ########er in.
I've since moved on to a street legal dual sport motorcycle. If/when I tip a deer over, I whip home and get my truck - a 30-40 minute round trip. For trips away from my local spots, I put the bike in my truck and bring it with me. Uses a #### of a lot less fuel than my Ram for commuting to work, too.

From a previous season:

I shot and recovered this, that day:

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