2026 Momentum 399M

Vehicle Photo
  • MSRP: $196,938
  • Dealer Discount: $20,763
  • Finance Incentive: $11,180
  • Sale Price: $164,995
  • As Low As: $1,187 /mo (Edit)
Stock #: 21175563
Tampa, FL
  • Available
  • New
  • Class: Fifth Wheel
  • Length: 0 ft
  • Slides: 3
  • Dry Weight: 19,170
  • Sleeps: 4

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  • Front Bedroom
  • Kitchen Island
  • Toy Hauler
  • Two Entry/Exit Doors
Floorplan
  • Available Beds Queen
  • Exterior Height 13 ft 6in
  • Exterior Width 8 ft 5in
  • Interior Height 8 ft 5in
  • Garage Size 12 ft 6in
  • Pin Weight 3,406 lbs
  • Gross Weight 23,500 lbs
  • Dry Weight 19,170 lbs
  • Fuel Capacity 60 gal
  • Tire Size 17.5
  • Axle Count 3
  • Fresh Water Capacity 140 gal
  • Grey Water Capacity 104 gal
  • Black Water Capacity 52 gal
  • Furnace BTU 35,000
  • Refrigerator Type 12V Stainless Steel
  • Refrigerator Size 20
  • Cooktop Burners 3
  • Shower Type Shower w/Seat
  • Number of Awnings 3
  • Electrical Service 50 amps
  • Washer/Dryer Available Yes
  • TV Info LR 50"" LED TV, Garage 32"" LED TV, Patio 65"" TV
Grand Design Momentum fifth wheel toy hauler 399M highlights:
  • Front Private Bedroom
  • Kitchen Island
  • Hybrid Desk/Dinette
  • Unobstructed Pass-Thru Storage
  • Side Patio

 

This toy hauler has all the comfort and convenience you could ask for! Once you have unloaded your toys from the 12' 6"" separate garage, you can start lunch on the exterior griddle located by the side patio. There is also a 65"" TV here and a 1.7 cu. ft. refrigerator to entertain guests! And if you have guests staying over, you can choose to add the optional Liftsuite system with underside can lights in the garage. If the weather isn't cooperating, you can make meals in the fully equipped interior kitchen, complete with an island, pantry, pull-out countertop extension and more. An L-shaped sofa with recliners is in perfect view of the 50"" TV and fireplace, and there is even a hybrid desk/dinette with windows where you can get some work done if needed. Head towards the front to freshen up in the full bath before heading to bed in the private bedroom. Here, you'll find a queen bed slide out with an optional king bed, a large closet with washer and dryer prep, plus a dresser with TV prep if you want the option to watch movies in bed!

 

The Momentum fifth wheel toy haulers by Grand Design are built for four seasons of travel with your off-road toys and include luxurious accommodations throughout for extreme living! Each is constructed to a superior standard with the fully enclosed and heated underbelly and storage area, the 5-sided aluminum cage, and the triple insulated garage floor. The MORryde CRE3000 suspension system and rubber pin box, plus the upgraded axle hangers provide the performance and smooth towing you desire, while the interior offers luxury such as color changing LED accent lighting, hardwood cabinet doors with hidden hinges, and a central vacuum system. Each toy hauler also includes four packages, including the Garage Package with Tuff-Ply gas and oil-resistant flooring, the Weather-Tek Package with a Stealth AC System, and the Interior Luxury Package with solid surface countertops!

 

 

†Lazydays strives to ensure the accuracy of the information provided on this website. However, actual products, programs and services may differ materially from those on this site. Lazydays is not responsible for errors made in stated pricing or specifications. Specifications and availability subject to change without notice. Price, length, weight, or any other specifications cannot be relied upon. Buyers should verify and confirm all claims made on the website. Sale price includes all manufacturer discounts and rebates. All prices listed on this site exclude tax, tags and title fees. Applicable government fees, state taxes, dealer fees and emissions testing charges will be added to comply with state vehicle codes. Freight and prep costs are additional and vary by state. Contact Lazydays for complete details.

*90 Days – Payments can be deferred for 90 days with approved credit. Interest accrues from contract date. Financing terms subject to lender approval. Not valid with other offers. Actual products, programs and services may differ materially from those on this site. Lazydays is not responsible for errors made in stated pricing. Specifications and availability subject to change without notice. Document fees vary by location. See dealership for complete details.

**Lazydays believes the specifications on this site supplied by the manufacturer to be correct at the time posted. However, specifications, standard equipment, model availability, options, fabrics, and colors are subject to change without notice. Some equipment may be unavailable when a vehicle is built. Some vehicles are pictured with options, which may be available at extra cost or may not be available on some models. You should verify the equipment that is on all vehicles. If a new vehicle shown on this website is subject to an open safety recall, Lazydays cannot deliver the vehicle to you until the recall repair is completed. This is a requirement of federal law.

***The advertised discount contains a $11,180 finance incentive. Finance Incentive applies if financing for your RV purchase is obtained with assistance by Lazydays and placed with a third party lender. Terms and Conditions may apply. Contact our finance department for further details.

****Margaritaville offer valid for a limited time only at Lazydays RV of Tampa. Customers who purchase a new RV or complete a qualified service appointment (appointment must be booked and customer must show for the appointment) are eligible to receive a complimentary 3-day, 2-night stay at Camp Margaritaville RV Resort of Auburndale. Offer valid while supplies last. Promotion is non-transferable, has no cash value, and cannot be combined with other offers or promotions. Limit one promotional stay per customer, per transaction. Resort stay subject to availability and blackout dates may apply. Resort reservation must be made within 30 days of RV purchase or completed service appointment. Valid for Florida residents and legal U.S. residents only, 18 years or older. Additional terms and conditions may apply. Lazydays RV of Tampa reserves the right to modify or cancel this promotion at any time without notice. Void where prohibited by law.