My DL is able to manage easy dirt, gravel, etc. It's not fun, but it's perfectly do-able. It's got enough clearance to handle rough roads, including potholes, ruts, speed bumps and more. Mud or soft sand are extremely unpleasant.
My KLR handles all that stuff better, and makes most of it fun--not merely tolerable. Soft sand and mud are the exceptions--it renders them manageable, but not fun.
The DL is way superior on pavement--faster, more comfortable, more fun. But on a 90/10 trip, the KLR is the one I bring because of that 10%.
Decide what kind of trip you're really going to take--not the one you dream of, in which you're floating endlessly across softly-sculpted sand dunes in the evening light, but the trip you're actually contemplating. If there's substantial mud or sand involved, bring a single. If not, you'll be pleased with the DL.
Hope that's helpful.
Mark
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