@Mark944 Welcome, here are some links to previous discussions. 
Ideas to carry on wheelchair - Guns & Gear - USCCA Community
Handicap carry on wheelchair - Legal & Second Amendment - USCCA Community
Wheelchair Carry - Miscellaneous - USCCA Community
Is there training for disabled:wheelchair/walker bound people? - Firearm Training - USCCA Community
Shooter on a scooter - News & Current Events - USCCA Community