A new image posted to Instagram by deezy_ftw from the Transformers: The Last Knight set at Lake Roosevelt, Arizona area seems to suggest that Wreck-Gar might be in the movie. An Autobot, Wreck-Gar was introduced in Transformers: The Movie (1986) hailing from the planet of Junk (thus often referred to as a Junkion) with an alt mode of a motorcycle. Since he is the only character that loves junk and that truck is literally overflowing with junk, its not a huge leap.
On a related note On Vacation Locations is reporting "a 14 mile stretch of State Route 303 from I-17 to Lake Pleasant Parkway in Phoenix from 2:00 AM Friday, June 10 to 11:30 PM on Wednesday, June 15."