Its not your door making noise, its the small window above the door. Dealers are removing that window and putting some sticky tape in it and the problem is solved. They did mine last time at shop and I can't believe how much quieter the cabin is now.
If your dealer does not know this trick have him call Jayco for instructions. I think just about every 35UN has made this window noise.
Also, your door hinge may start squeaking as it swings. A dab of WD-40 type lube on the hinge will shut that right down. The hinge will not make any noise while closed however, that noise is the window moving around in it's frame.
2015 Jayco Precept 35UN
Towing JEEP TJ with Roadmaster plates and bar w/Blue Ox Patriot brake
an Aluma low bed trailer with HD Road King and/or Polaris RZR onboard