Dude, just put a cork in it. I'm not going to comment on your ability, but as someone who grew up on dirt bikes, and rides MX now, I can say I have a healthy respect for how well those two guys do. Those are BIG bikes, carrying a lot of gear, ridden in very harsh conditions - you cannot even begin to comprehend how physically taxing it would be.
As for DR650's, they would struggle with carrying that amount of gear, and once laden down with that sort of weight they would be no easier in the rough stuff. And I bet they'd break down more often than those beemers too. Anyone who owns a dirt bike knows how much maintenance goes in to them. K's on dirt cannot be equated to K's on tarmac, your maintenance schedule for a sports bike drops from 5-10,000 kilometers to 50-100 hours.
Respect to those boys, and good luck for the journey.
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