Glad to hear you are on the mend.
I have given more thought to the wheelchair ideas. I may build a 3 wheel single rear drive trike that he can back his existing chair into. Not going to be as light or convenient, but I can optimize it for travel, and build in a lift system to lift his chair up for decent ground clearance. I am not at all comfortable with two e-motors and only differential power for steering at any high speed. Things happen too fast
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2007 Dodge Ram 3500 SRW 4x4 with 6MT
2003 TDI Beetle
2002 TDI Beetle
currently parked - 1996 Dodge 2500 Cummins Turbodiesel
Custom cab, auto, 3.55 gears