Posted John's saga because this OP has a wheel OEM that I'm not familiar with
and suspected issues with the type of valve stem
There is a Myers tire catalog embedded in John's thread...it one of my go to
reference catalogs on this topic
It may seem like a static area around the valve stem hole, but all wheels flex
and the higher the weights, the more likely it will flex. Why the seal must
be correct...it moves ever so slightly all the time
Good luck!
PS...Dealers generally only advise on stuff that they carry in stock, can get
easily and know anything about. Working my through college, one job was a tire
monkey and where learned to love Myers as my reference catalog. Still
to this day, reference the Myers catalog
Myers Catalog