2025 Grand Design Momentum 399TH

New Fifth Wheel in Knoxville, Tennessee, 37924

$170,577.12
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Enjoy your RV trips more than ever before in this 2025 Grand Design Momentum 399TH. Be a part of the Grand Design family with this 2025 Grand Design Momentum 399TH. With three slides, this rig feels roomy and spacious inside.

2025 Grand Design Momentum 399TH Features


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Lazydays RV of Knoxville

Lazydays RV of Knoxville

835 Huckleberry Springs Road
Knoxville, TN 37924

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Unit Specs

  • Stock #21161920
  • Year2025
  • ManufacturerGrand Design RV
  • Make Grand Design
  • ModelMomentum
  • Floorplan399TH
  • Type Fifth Wheel
  • ConditionNew
  • Length43' 0"
  • MSRP$170,577.12
  • Slideouts3
  • Dry Weight16,866 lbs
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Lazydays RV of Knoxville
Lazydays RV of Knoxville

835 Huckleberry Springs Road
Knoxville, TN 37924

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2025 Grand Design Momentum 399TH Gallery

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New 2025 Grand Design Momentum 399TH available in Knoxville, Tennessee

New 2025 Grand Design Momentum 399TH available in Knoxville, Tennessee

2025 Grand Design Momentum 399TH - New Fifth Wheel For Sale by Lazydays RV of Knoxville in Knoxville, Tennessee

2025 Grand Design Momentum 399TH - New Fifth Wheel For Sale by Lazydays RV of Knoxville in Knoxville, Tennessee

2025 Momentum 399TH by Grand Design from Lazydays RV of Knoxville in Knoxville, Tennessee

2025 Momentum 399TH by Grand Design from Lazydays RV of Knoxville in Knoxville, Tennessee

New 2025 Grand Design Momentum 399TH available in Knoxville, Tennessee

New 2025 Grand Design Momentum 399TH available in Knoxville, Tennessee