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One of the things about driving on gravel is you should deflate the tires a bit in order to make it easier on the suspension. Otherwise, you're going to beat the daylights out of the suspension on the Subaru.
The 2500HD will take it, no doubt but you'll be missing fillings out of your teeth! I spent a good amount of time driving my dad's F350 (leaf sprung 1 ton) on gravel roads and wow! What a ride!
Any chance you'd be able to carrry an air pump and deflate the tires, then reinflate?
I'm not sure about your specific vehicle, but my focus gets the best mileage going 35MPH. If I were trying to get the most out of every gallon, I'd deflate the tires enough that I could go 35MPH comfortable (without destroying the suspension), then reinflate once I was on the highway.
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