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New 2026 Outdoors RV Back Country Series MTN TRX 20MKS

Travel Trailer
Stock # 31407
Sumner, WA
Outdoors-RV-Dealer-PNW SEO-Optimized-May-2026
The ultimate off-grid couple's expedition trailer—engineered with a built-in Cummins Onan generator, a custom off-road HD chassis, and elite 4-season climate protection.
  • Sale Price: $66,339
  • MSRP: $86,218
  • Save: $19,879
Payments From: $285 /mo.
  • 25ft long
  • Sleeps 2
  • 1 slides
  • Murphy Bed
    Front Bedroom
What Other Customers Are Saying

  • Thank you Sumner RV sales staff, you were amazing!!

    I want to just personally say thank you to Andy and the sales team. We recently purchased a unit (which we received a lead from the Sumner RV sales team) and after our purchase we had to sell our Bigfoot camper. We attempted to sell it on several social media sites including craigslist and OfferUp but
    Ken

  • These guys are top notch. All of them!

    These guys are top notch. All of them! Thanks Vince for helping us with the sale ahead so we walk in, sign and go. Todd in finance had our deal set up ahead so we knew what we were doing. No surprises. Tim was great in the walk-thru and set up the new hitch. and Jeremy jumping in with the assist in
    A

  • We highly recommend Sumner RV and ORV manufacturing.

    We recently purchased a new ORV 22 FQS. Andy made our shopping experience so easy. We were wanting to upgrade our quality but maintain the size trailer that we previously owned. We fell in love with this design. Everything about it seems solid, comfortable, quiet and elegant. We had a brief and very
    Susan
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Sumner RV is not responsible for any misprints, typos, or errors found in our website pages. Any price listed excludes sales tax, registration tags, and delivery fees. Manufacturer pictures, specifications, and features may be used in place of actual units on our lot. Please contact us @253-863-5644 for availability as our inventory changes rapidly. All calculated payments are an estimate only and do not constitute a commitment that financing or a specific interest rate or term is available.

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