You would want urethane casters and of course a 24" rear wheel (maybe semi-pneumatic depending on how rough these trails are), foot rests with heel loops and a decent frame thickness. You will be trading off a more ergonomic seat.
By the time you do that, you're largely in custom territory and it's a ~$1K proposition, so I would start the paperwork for a power chair now, anyway. If you can afford a manual chair like that, check out your options on SpinLife and similar sites, where you can filter on features. Invacare chairs have been fairly durable but Karman has nice ergonomics/looks.
Best,
Laurie