It has been 42 years since I spent much time in Arizona....but as as a potato buyer...I remember "buying" about a million dollars worth of potatoes during the months of May through July from the Queen Creek area of Arizona. Most of the potatoes were Kennebec, Monona and FL-2. The potatoes were shipped on rail cars to processing plants across the USA.
That said, there are some good YouTube videos to view...many are associated with additional related videos also.
http://www.youtube.com/watch?v=Vpu5QOADENg
I am preferring to send you to these first and then...if you have more questions just post those questions here or in a private email.