Our farm is extremely wheelchair-unfriendly. The property features a gravel driveway, plenty of mud, uneven surfaces, sloping terrain; it would be impossible to navigate in a conventional wheelchair.
Russian company Velobig recognizes that not all wheelchair users live in paved urban environments. Thus they developed the ECar, an electric-powered off-road wheelchair with impressive capability:
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As there's no rollover protection, I'd be nervous about using this on some of the more challenging parts of the local terrain; but I think with some common sense and careful route selection, I could use this to get most places I needed to go around here.