Serving the Central Coast and Beyond for over 45 years
Sales 1-800-847-2989 Service: 1-805-929-2254 Parts: 1-805-474-1603
Get Approved Now!

New 2017 Grand Design Momentum 399TH

Virtual Tour Video Tour Sold
Call 800-847-2989
2017 399TH Features and Options

This unit has been sold. Please Click here to view our entire inventory of Momentum 5th Toy Haulers.

Your local dealer DOES NOT WANT YOU TO SEE HOW LOW OUR PRICES ARE! MSRP on this unit is $110,476. Click "Get Rock Bottom Price" to the right and one of our sales team members will send our LOWEST price directly to your inbox! We are the Low Price Leader. Make sure you compare the options that we offer to your local dealers list! Buy with us and save THOUSANDS!

Model 399TH offers a 13' garage for the toys, plenty of sleeping space for a few extra buddies to tag along, and kitchen and bath amenities like home. Check it and a half baths, a fireplace, an 18 cu. ft. refrigerator, and a fold down side patio, plus so much more! How's that for living on the edge....of fun that is!

The rear ramp doors will make loading and unloading a snap. Inside the garage area you will find an LED TV, overhead cabinets in the corner, an overhead loft near the front of the garage, and a half bath so you can easily keep all the dirt and grim out of the main living space. In the cargo area there is a side man entry door also, plus just off the garage you have access to a fold-down side patio to enjoy a little down time outside including a 16' awning overhead.

There are dual opposing slides in the main living room and kitchen area. An 18 cu. ft. refrigerator will keep all of your cold stuff cold, and there is a three burner range and overhead microwave oven for all of your cooking needs. A center island features a double sink, plus added counter-top prep space.

Opposite along the road side another slide with a free standing dinette and theater seating for two. An entertainment center with fireplace below is along the angled outer bathroom wall and easily viewable from the seating in the room.

Head up the steps to a front master bedroom and complete bath. The bath is found on the right at the top of the steps up and includes a large shower with skylight, linen cabinet, toilet, and vanity with vessel bowl sink. A second bath entry door slides to allow easy access right into the front master.

Momentum Interior Package (see below)
Momentum Exterior Package (see below)
Momentum Garage Package (see below)
Weather-Tek Insulation Package (see below)
Under Unit Blue LED Light Kit
Generator - Onan 5.5KW Gasoline Generator
2nd A/C Bedroom 15K BTU
3rd A/C Garage 13.5K BTU w/Load Management System
King Bed Upgrade
Super Sofa Upgrade
Happi-Jac Electric Bunk System w/Folding Sofas
Real Aluminum Deck System w/Rear Box Awning
Momentum Patio Steps w/Hand Rail
3 Seasons Garage Wall
Swivel Rocker Recliner - Garage
Momentum Patio Chairs
Exterior Entertainment Center
Auxiliary Fresh Water Tank

Momentum Interior Package
40-48" Class LED TV in Living Area
Stereo Entertainment System w/Bluetooth in Living Area
Night Shade Window Coverings
Central Vacuum System
Recessed LED Puck Lighting
30" Stainless Steel Microwave
Solid Surface Countertops & Sink Covers
Stainless Steel Undermount Kitchen Sink
3- Burner Stainless Steel Range w/ 22" Oven
Large Kitchen Pantry
Pre-Wired & Braced for 2nd A/C in Bedroom
Pre-Wired & Braced for 3rd A/C in Garage (Includes Energy Management System and 3-Zone Thermostat)
Washer/Dryer Prep
12 Gallon Gas/Electric Water Heater
Centralized Interior Command Panel (Living and Garage)

Momentum Exterior Package
Trail-Air® Rota-Flex® Pin Box
Trail-Air® Equa-Flex® Suspension
Correct Track® Suspension Alignment System
7,000 lb. Axles w/Ultra Lube Hubs
16” Aluminum Wheels
West Lake® E-Rated Tires w/NitroFill™
Slam-Latch Baggage Doors
Frameless Tinted Windows
Dual Entry Doors
Partial Paint Gel Coat Fiberglass Front Cap
Easy Open Aluminum Entry Steps
Exterior Security Lights
Power Patio Awning w/LED Lighting
Enclosed Fuel Pump Station with Dual Fuel Tanks
Satellite TV Prep (All TV Locations)
All-In-One Exterior Utility Center
50 Amp Service
75 Amp Converter
12V Battery Disconnect
Generator Prep (Required w/o Generator Option)

Momentum Garage Package
2nd Power Patio Awning w/LED Lights (Side Garage)
Folding Flat Roof Ladder
Protective Diamond Plate on Garage Sidewalls
In-Floor Garage Storage Box
2,500LB Rated Flush-Mount Tie-Downs
Ram-Air Garage Vents (Both Sides)
Tuff-Ply Gas and Oil Resistant Garage Flooring
Spring-Loaded Rear Ramp Door
Rear Cargo Loading Lights
29-32" Class LED TV in Garage
Stereo Entertainment System in Garage w/ DVD

Weather-Tek Insulation Package
R-Value (R-40 Roof / R-45 Floor / R-11 Sidewalls / R-25 Garage Floor / R-24 Slideroom Floor)
Fully Enclosed and Heated, Underbelly and Storage Area
Enclosed and Heated Low Point Drains
Engineered Underbelly Airflow Heat Paths
Insulated Heat & A/C Ducts
Attic Vent
Plumbing Line Insulation Barrier

In addition to the optional features listed above, this coach features the standard following features:
Drop Frame Chassis
Under Mount 16” Spare Tire
6-Point Hydraulic Leveling System
High-Gloss Gel Coat Exterior Sidewalls
Under Unit Blue LED Lighting Kit
29-32" Class LED TV in Bedroom
TV Prep in Bedroom
Digital TV Antenna w/Booster
Interior Blue LED Accent Lighting
Raised Panel Hardwood Cabinet Doors w/Hidden Hinges
Sofa w/Heat, Massage and LED Lighting Package
Residential Kitchen Faucet
Flush Mounted Range Cover
Stainless Steel 18 Cu.Ft. 4-Door Refrigerator
60” x 80” Queen Memory Foam Bed Mattress
Residential Style Headboard
Under Bed Storage Area
Individually Switched Reading Lights Over Bed
Bedside110-Volt Outlets
One-Piece Fiberglass Shower w/Glass Door
Skylight Above Shower
Porcelain Toilet
Vessel Bowl Sink
Medicine Cabinet w/Mirrored Door
15k BTU A/C in Living Area
2nd 13.5k BTU A/C in Bedroom
12v High Power Fan (Kitchen)
35k BTU High Output Furnace
Fireplace w/5,000 BTU Electric Heater
12V Tank Heaters w/Interior Switch

Similar RVs and Floorplans


Location: Nipomo
Stock# 6848
These photos and this video are of the actual unit.
2017 399TH Specifications
Sleeps 7
Slides 2
Length 43 ft 4 in
Ext Width 8 ft 5 in
Ext Height 13 ft 5 in
Interior Color Espresso
Hitch Weight 3400 lbs
Gross Weight 20000 lbs
Dry Weight 15900 lbs
Fresh Water Capacity 117 gals
Grey Water Capacity 104 gals
Black Water Capacity 104 gals
Tire Size 16
Furnace BTU 40000 btu
Visit Us Trailer Hitch RV Sales
215 N. Frontage Road
Nipomo, CA 93444
Toll-Free: 800-847-2989
Local: 805-929-8095

Trailer Hitch RV Service
545 Sandydale Drive
Nipomo, CA 93444
Toll-Free: 1-800-847-2989
Local: 805-929-2254

Trailer Hitch RV World Parts
1530 West Grand Avenue
Grover Beach, CA 93433
Local: 805-474-1603
Main: 805-474-1603
Get Directions
For more information, call us at 805-929-8095 or Contact Us
Grand Design Recreational Vehicles is a superior quality manufacturer of towable fifth wheel and travel trailer RV's. Based in Middlebury, IN, Grand Design RV focuses on providing the highest quality and more premium standard features than any other RV's in their class.

Founded by close friends Don Clark and brothers Ron and Bill Fenech (each having over 25 years of experience in the RV industry).  Although they have lead some of the most successful companies in the RV industry, and are proud of their accomplishments at Keystone RV, they recognized that it was becoming more difficult to stay in touch with the needs of customers, employees, and the products being built. 

So, in 2011 they began pursuing their dream of reconnecting on a more personal level with customers and dealers.  The result of that pursuit is Grand Design RV.  A company designed to create recreational vehicles that provide more features, better designs and unparalleled customer support!
Trailer Hitch 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 @805-929-8095 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.