i'm not sure what your issue is, with your sewer hose. why would you need to heat a sewer hose? is there a reason your Roadtrek sewer hose is different than the kind that the rest of us use?
because Roadtrek Class B's are a very small section of the RV market, i think you'd get better/quicker assistance from the Roadtrek owners website:
http://www.roadtrekchapter.org/even a call to Roadtrek's customer service dept. would probably get you the info quicker.
Dan- Firefighter, Retired:C, Shawn- Musician/Entrepreneur:W, Zoe- Faithful Golden Retriever(RIP:(), 2014 Ford F150 3.5 EcoboostMax Tow pkg, 2016 PrimeTime TracerAIR 255 w/4pt Equalizer and 5 Mtn. bikes and 2 Road bikes