I have the same issue: trailer fault message and rapid blinker indicators. My issue started when the battery died randomly one night. I jumó started it and everything is working great, except for this weird software glitch. Did you get it resolved?
Only issue so far is that my center screen menu area at the bottom won’t render anymore.
Dealer had me reset it a few times by disconnecting the battery, etc and it won’t come back. I have to take it back on Saturday to have them check it out.
Any ideas? Looks hardware related to me.