I found this accessible van rental company online. They are located in Selkirk Ontario. I rented a van once to get my Doppler ultrasound in Barrie. The van was great and the service excellent. I plan to rent one of the vans to go to New York state for my treatment. I highly recommend that you check them out if you need an accessible van to drive to New York.
I am not receiving any referral rewards for posting this. I know personally how difficult it is to travel in a wheelchair and I could not find another rental company that offers this service. Here is their web site.