I had a close friend here in Auckland that had Muscular Dystrophy who was a Rodder and we all took turns of taking him out in his '39 Oldsmobile on runs etc.. It used to take two of us to lift his electric wheel chair into the boot of the Olds but we never complained as he enjoyed the outings. So, what I'm trying to say is, I admire you for thinking about how to transport your wife's wheel chair so that she can enjoy the events too, sir you have my utmost respect.
Mark.