I believe Newmar does use the waterless HepvO trap, at least under the shower. Not sure how far back their use goes, so can't comment specifically on your 2015 model. I would certainly not use any mechanical drain cleaning tool until after I had spoken with Newmar customer service. They should be able to tell you if, and where, waterless traps are used in your coach.
Jim (W7DHC), Diane & Mini Schnauzers, Lizzy & Ellie
2018 Mountain Aire 4047
2014 Honda CR-V 2020 Lincoln Nautilus "toad" w/AF1