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I hope I did the photo correctly. I purchased Two Swivel bases from a Coachmen Dealer (also used on Forest River units. I installed both in only a couple of hours. The swivels are made by Atwood (yes there is a left and a right) and cost about $370 each plus shipping. There is a lever on the inboard side that moves the seat at a 45 degree angle back and center, permitting clearance from dash/steering wheel or side doors. I did add about 3/4" in spacers to increase height some. My floor behind seats is only a bout 1.25" higher than the cab floor. They work great but some may feel they are to low when turned and I agree it would be nice to have a power seat option raising them. May research that in the future.
Video at River Forest showing them turning the seat see: https://www.facebook.com/ForestRiverClassC
Also see: http://www.forestriverforums.com/forums/f18/swivel-seats-32330-5.html POST #49 for photo of his installation (looks similar to mine.)
I agree if you have a dinette or other item close to your seat back then a swivel is not for that seat.