The Parker Solar Probe will experience forces and torques as it passes within about 8.5 solar radii of the Sun's surface that even a General Products hull will not protect it from.
How large will the tidal acceleration be along the 3 meter length of the spacecraft at perihelion? Will it be detectable in any way?
Will there be any (real or effective) torques that will tend to rotate the spacecraft during it's closest flybys? What about effects due to the oblates of the sun?
Will any of these be a new record - or have Cassini or Juno experienced greater effects during their closes approaches to Saturn and Jupiter already?
above: Parker Solar Probe cropped, from here.
above: screen shot from NASA's Solar Probe Plus Fact Sheet note: the link seems to be dead now, but there is plenty of related information available at http://solarprobe.jhuapl.edu/index.php#spacecraft
above: Illustration of Parker Solar Probe's orbit, from here.