The '08 KGDB is terrible too. I went to the Villa factory in Elkhart and they did a partial rebuild on the seat. Put in firmer foam and shortened the seat some. It's better than it was, but there's still no side-to-side support.
I enquired about swapping the seat out totally, but there was no way to do it because none of their current seats (with better support) would fit the original mount under the floor. And because of the integral seat belt, the mount couldn't be changed without significant engineering cost and re-certification.
Next time we head out for a season, I'm going to see about getting some bolster pillows to wedge into the corners for some side support.
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2008 King Aire 4562, Spartan K3(GT) w/ Cummins ISX 600
2014 Jeep Grand Cherokee Overland 5.7L V8 Hemi w/ Blue Ox Aventa LX Tow Bar and baseplate, SMI Air Force One brake
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