E450 swivel seat

I have a 2010 Coachman Freelander on an 08 450 chassis. The passenger seat could not recline at all due to a dinette bench seat that was installed behind it. I removed the dinette seat. Could recline the seat, but passenger foot room was still very limited. I re-drilled the floor mount and was able to get another 2 1/4 inches of leg room. Helped a lot. While I had the mount out I installed a honeycomb reflective aluminum foil insulation layer under the carpet. Also a big improvement. The seat is not plush; pretty much a standard leather-like seat. I could put a swivel on it. Might have to remove the only arm rest (left side) to swivel. Due to the layout of our interior I wouldn't gain anything by swiveling.

Haven't looked at a 2015 F450 cockpit. My major complaints of the F450 cockpit are the very limited passenger legroom, and the excessive heat of the floorboard and passenger side of the engine cover.