Well I tried it out this morning. Towed the wheelchair 1 1/2 miles to the coffee shop in Hawi. It worked perfectly and un coupled in seconds.
On the way home I stopped by the grocery and loaded some milk and food into the chair, then drove home. Judging from the electrical indicators on board,
It didn't seem to use a noticeably greater drain on the battery. I would have to call the experiment a success.
It only takes seconds to un hook or rehook the chair.