Think you should pay a bit more and get a 13/14 with higher miles. Got 115k miles on mine and its running like a champ. Take it off road once a month, ONLY thing rattling is the Roll N Lock tonneau cover. Major service (over the past 5K miles) included fluids, spark plugs, steering pump (Lee's), replacing the suspension with 3.0 takeoffs, KCH front buckets, Deavers +3. Did a compression check, the engine is rock solid. The ONLY thing is the occasional transmission jerk, but thats more a FORD than a Raptor issue.
BUT if your dead set on the '11... it would be a great buy UNDER $29K IMO