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You won't like this, but the surron is the greatest outdoor bike there is.
It only weighs 100lbs, has the range of 40 miles, it's electric (quiet), only 2kwh battery (less than 25 cents to charge), it's capable of climbing anything, it's light enough to lift it over debris, it only costs 4k stock.
Realistically you could camp with a 10lb 100w portable solar panel charger and get enough juice to dirtbike 10 miles in a day while keeping the other 50% of the battery charged to service electronics and emergency situations.