Thanks for the comments SS.
I haven't had a cook that lasted long enough yet for me to be required to refill the charcoal basket, but I would think it would help in that case if needed. Just remove the middle section, shake the basket and remove, safely store hot ash, reload and rebuild.
As for the wheels, I haven't had to move my WSM, so I haven't thought to add wheels to it yet. If I ever get around to the tables, I will probably need to add them for the stability.