As large as you are, I'd go for a Honda 650. They have great aftermarket support, good suspension, electric start, and are tall.
Man... I dunno though... On the one hand.. I firmly believe an 80's-style seating position geometry like you'd have with the saddle on that XR650L would be pretty nice out there and likely appreciated in terms of all-day comfort.... that's just too much weight though man.
Those BRP's ("Big Red Pigs" as they're affectionately called (the XR650R, and some people also refer to XR650L that way) are 346Lbs man! That's heavy, even for somebody in His size range. That's likely too heavy of a vehicle for this task, assuming this task involves really going back in far on a single track goat trail.
Imagine you've rode it in as far as you can ride it, THEN... you Hike in even further, maybe do a harsh climb or two? Get back to that bike all whipped and spent. You ain't gonna wanna be wrestling a 346Lbs machine man. Bottom line.
And remember... you STILL have that pack on too! Ya gotta strike that balance between enough power that the climbs are not sketchy due to lack of power, but not too heavy as to prematurely fatigue you out, which can contribute to a possible crash.
If you're talking mountain hunting, you're talking single-track trails that at some point, are gonna get precarious and sketchy feeling... rutted.. chocked full of rocks... possibly presenting you with tricky abrupt hillclimbs in soft terrain. NOT the time to be riding a 350Lbs bike with 45+ Lbs strapped to your 270Lbs body. At least... not when a 220-250Lbs better suited option is available.
And the only reason why I'm saying that, is because once you start strapping stuff onto your body on a moto out in the dirt?... it starts rapidly limiting what you can do, riding-wise. And what kinda lines you can pull off trying etc.
As you'll be less inclined to properly stand-up on the pegs like you normally would riding thru a particular kind of obstacle type the trail presents with.
Also, not for nothing, but what about when things DON'T go your way.. let's say on a hillclimb line... and shoot!.. you lost fwd momentum, and dug in, so now ya gotta turn it around, on the side of a hill, and ride it back down, bump-starting it back to life... get back down.. to then mount another attempt.
TRUST ME... it's exponentially easier to do that, the lighter that bike is!