As to speed, my advice is do yourself, your passengers and the other drivers around you a favor and keep it under 70 and preferably 60-65. RV's are not cars and they don't handle like cars. They are big, heavy trucks and are 5 or 6 times heavier than cars. Because of their design they catch a lot of wind, which if you're not careful and careening down the road at 70+ can easily cause you to lose control very quickly. And finally, as already noted by others, you gas mileage will suffer greatly if you push that V-10 to 70+. Take your time, enjoy the scenery and stay safe. We generally stick to back roads specifically to avoid the hassles and bordom of the Interstates and the speeds they require.
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