I'll not need to have chair with me as I'm fit to walk only time i use the wheelchair is for long distances of walkingThe major issue I see is you get in and drive off leaving your chair behind! what happens if you need to get out of the tractor for what ever reason, (break down, implement issues or adjustment etc etc) or when you come back some arse has moved your chair as they thought it was in the way! or run over it!
Something like a fastrac would have the scope to lift you in the cab then place your chair on the back load bay so you can take it with you?