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  1. #1
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    2015 Momentum 380th axles

    The specification sheet on this unit indicates three axles. Mine only has two axles rated 8 K lbs each. The GVWR is 19500 lbs. Should this unit have three axles?

  2. #2
    Seasoned Camper
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    Quote Originally Posted by DavidS View Post
    The specification sheet on this unit indicates three axles. Mine only has two axles rated 8 K lbs each. The GVWR is 19500 lbs. Should this unit have three axles?
    Depends on your pin weight. If you have a GVWR of 19.5k lbs with 2x8k lbs axles, then it's assumed you'll have at least 3.5k lbs on your truck's drive axle. That seems heavy for a tandem axle, but I'm unfamiliar with your model.

    Sent from my SM-N986U using Tapatalk

  3. #3
    Site Sponsor orbiker's Avatar
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    We almost bought a 2015 380TH. The dealer had one on consignment and made a great offer. The owner said no, but the dealership stood by the offer on a new 2016 380TH. Both had the exact same floorplan. The décor was nicer in the 15.
    I think the late '15's had 3 axles like the '16's. The '16's had cheaper tires ( E rated 16 in.) and the 15 has 17.5 H rated.

    I also think the older models were built better with no corners being cut.

    Look at you data tag. It looks like this. This fact on your rig.

    This is from a '15 for sale in AZ. KEN
    Backpacker and tent camper all my life, including BSA as a kid and adult. Motorcycle trips with a tent too 1978 to Present.
    2-10-05 - 2002 F350 CC SWD PSD and a new 2003 Citation 10'8S mostly for Crater Lake Ski Patrol.
    2016 Grand Design 380TH as of 10-29-2015. It's HUGE. Update: Traded Momentum for a New 2018 374TH-R Solitude as of 3-16-19
    10-19-18 - traded truck for a 2016 Ram 3500 DRW Laramie Crew Cab 4 X 4 Long Box.

  4. #4
    Site Sponsor orbiker's Avatar
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    Did you know about the hidden storage?
    On some 380TH's the left and right panels around the fireplace open. If not, it's easy to put hinges on them.
    The top area around the fireplace should flip down.

    Check it out. KEN
    Backpacker and tent camper all my life, including BSA as a kid and adult. Motorcycle trips with a tent too 1978 to Present.
    2-10-05 - 2002 F350 CC SWD PSD and a new 2003 Citation 10'8S mostly for Crater Lake Ski Patrol.
    2016 Grand Design 380TH as of 10-29-2015. It's HUGE. Update: Traded Momentum for a New 2018 374TH-R Solitude as of 3-16-19
    10-19-18 - traded truck for a 2016 Ram 3500 DRW Laramie Crew Cab 4 X 4 Long Box.

  5. #5
    Site Sponsor JCR GD's Avatar
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    Quote Originally Posted by DavidS View Post
    The specification sheet on this unit indicates three axles. Mine only has two axles rated 8 K lbs each. The GVWR is 19500 lbs. Should this unit have three axles?
    I think that is why the later 15s had triple axles (the pin weight on the tandem was very high to stay within trailer axle ratings.)
    Jim (& Sharon)
    2015 GD Momentum 385TH w/ Joy Rider shocks, Sailun 637s & 3" Garage extension, LifeBlue Lithium.
    2015 Ford F-350 DRW 4x4 Lariat w/ AirLift bags, Titan 65 gal. OEM replacement fuel tank.
    The toys:
    2017 RZR XP 1000 EPS SE
    2018 Fiat Abarth Cabrio

  6. #6
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    All Momentums were originally 2 axles for the first 2 years.

    The big boys (like yours) were 8000lb axles with the 17.5 H range wheels and tires. Minimum pin weight was over 3500lbs on them. That is how you get your 19,500 GVW.

    Shortly there after, GD switched to 3 axles because consumers had a hard time making the numbers work in their heads with 2 axles.

    Lots of luxury 5th wheels still do the same thing.....Heartland Landmark for example.
    Inventory Manager at Tom Schaeffer's RV, Shoemakersville, PA www.tomschaeffers.com
    [email protected]
    2011 RAM 3500 SRW Outdoorsman Edition 4X4, 6.7 Cummins--TWEAKED!
    2021 Reflection 310RLS

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