The info on the site is not strictly accurate now - I also rang the Club to check and they confirmed that visiting wheelchair supporters would be positioned in the Main Stand.
However, when I got to the ground and attempted to enter the Main Stand the stewards told me that it was possible to sit behind the goal with the rest of the away support.
They have taken 2 or 3 seats out in the front row to allow wheelchair users to sit in those spaces (beware of flying footballs - you are very close to the pitch)
Facilities wise I didn't use the toilet but this is housed in the adjacent (home) stand. Refreshments are available from a small kiosk between the away stand and the Main Stand.