Kersey Mobility sells wheelchair accessible vehicles and driving aids but does not currently sell power chairs.
I do not have power chairs but I bet you they can handle everything else you need and get you to the right person. There is a spot in Bellevue have some virtually free they are checked out rebuilt
Im not sure about the power chair either. But they are VERY helpful and if they dont have it I am sure they can send you in the right direction.
I'm not sure about power chairs I had a left foot accelerator put in. But they were awesome!!
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