One of the guitar mags (probably Guitar Player) used to ship with one of those flippy singles in each issue, and I had a roommate who subscribed. One of the records was a Frank track (I think two , actually) and the credit included “Impossible Guitar Part by Steve Vai”. :^)
The 1988 Tour was great for us fans (I caught a show early in the tour) but bad for Frank. There was terrible infighting and the tour imploded shortly after this performance. It was the last time many of us got to see him live.
A few vets of this tour still play today...Ike Willis has several tribute bands (Project Object notably) and Mike Keneally has emerged as a prolific composer and bitchin guitarist (and keyboardist....sometimes simultaneously); Keneally splits his time between backing Joe Satriani and touring with a new Beer for Dolphins outfit. I met both of these guys and you can't meet a more humble group of superb musicians.
I don't want to stretch this too much, but Trump and Frank are two of the most "I really could care less what you think of me" guys to ever walk the planet.
Thanks for posting. I encourage you to check out Dweezil playing Eruption.