My cousin bought a Grand Design in 2018. I noticed one of your line items noted gaps near the gutter seams.
My cousin did notice similar issues just after delivery, seams near the gutter looked suspicious, and brought the unit back to the dealer twice for
You obviously know your way around TTs.
My cousin noticed sidewall delamination this past summer, just out of warranty, and sure enough when I inspected their roof found a myriad of gaps, separations, and 1 open crack in lap sealant around their skylight.
As Grand Design rejected their claim I documented and repaired their issues for my cousin.
Here's what I found, 1st pic shows gap above gutter, 2nd pic shows the open crack in lap sealant on sklight, 3rd pic shows cracks on front lap seam, 4th pic shows cracks on rear lap sealant.
Factory sealing was thin, and this roof had received maintenance at least twice since 2018. When I closely inspected the rear cap seam I was horrified I could actually see how thin the self leveling sealant was applied, I had to completely redo that seam from side to side..
Remaining pics are my repairs.