That's rough! I feel a bit of that pain. I bought a new Lund this year (different dealer than yours). It's a 2019 but was still brand new. The boat and motor have been fine, but the set up by the dealer was terrible. I had to rewire many things and was not impressed by the amount of mistakenly drilled holes they made when installing the transducer and bow mount motor. I fixed all of that with a transducer plate, and I used heavy duty 6 awg wire and a 70amp plug for the trolling motor.
I've got cavitation burn on my prop (maybe 30 hours on it) so bad it needs to be replaced already. I'm working with a different marine shop now to diagnose why. No way the dealer I got the boat from will ever touch anything on it unless its a Lund warranty issue.