As mountains go, the grades on I-40 from Charlotte to Asheville are not bad; I don't recall any really steep climbs, most are rather gradual. Having said that, it would probably be a good idea to check the manufacturer's towing specifications on your Explorer to determine hitch weight, payload, tow capacity, GVWR, etc. Also do you have a transmission cooler, brake controller, weight distributing hitch and anti-sway control? All factor into whether or not you can safely tow your camper in the mountains.
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