When I was looking at Trikes and Trike Conversion kits in the Phoenix, AZ area, I rented a Goldwing with MotorTrike kit from Southwest Trikes. Here's a link to their website:
'http://southwesttrikes.com'
I took a quick look at their website, and it looks like that they still offer goldwing trikes for rent. AZ bike week is usually around the 1st of April, so the availability of rental units may be scarce at that time. My advice is to locate a rental unit and tie it down as early as possible.
Good Luck and Happy Triking
Hepengr - Globe, AZ
PS: It you're in the Phoenix area in April, lets get together for a ride. Globe
is one of the popular stops on the spring bike tours.