First: Thare some videos around here in a STICKY at the top of one of the forums which say Watching these videos MAY (emphasis mine) Save your life.
Believe the subject, there is only one video.
Second. You said you had the dealer check the pressure.. Have you ever scaled the RV? Two pressures all but guaranteed to be wrong for your RV are
The one on the sticker inside the RV
The Maximum Pressure (Used only if carrying maximum load) Both of which are molded into the tire itself.
Oh and a 3rd one.. The one the dealer inflates it too.
Only way to get it right is to scale it and look up the proper pressure.