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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

  • Thanks for taking such great care of us.

    Thanks for taking such great care of us. Unit was exactly as described, everyone friendly and helpful and when I had a problem with the hitch the service department dropped everything and made me a part so I could attach my bike rack. We had a great 3 week vacation in our used Born Free, everything
    Anonymous

  • Thanks Sumner RV!!!!

    The R-Vision Onyx is a great trailer . Great price, service, and accessories. The guys at the Fife location were helpful, yet they allowed me and my family to overlook and research the trailer on our own accord with no issues or hassels. The freedom to look it over top to bottom was very nice. The negation
    Issaia

  • We've already taken a two-week trip and were loving it!

    We searched high and low on the Internet and contacted many of the individuals and dealers located on the west coast that had the rig we wanted. Sumner RV Center, located in Sumner, Washington, and their team members from sales/service to management to finance ticked all of the boxes for us. The Sumner
    Anonymous
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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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