BrothelLife

For a measly $15K, you too can race mountain bikes in their environment, and not break a sweat.
https://bowheadcorp.com/
Interestingly, this product can be hauled behind your vehicle on a hitch receiver.  Most "off road" "wheelchairs" need a trailer to haul them around, and weigh 400-500 lbs.  Typical pricing is $12K - $25K.

That's cool you should get one.?

When I saw the title of the topic, I thought it would be one of those tracked wheelchairs...

I was just at the Abilities Expo in Chicago.

They had the tracked chair, as well as other ones.

The problem with all of them is the high cost, and for most, the weight and size.  Typically a trailer is required.  If one can manage a trailer, they likely don't need a wheelchair.