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  1. #1
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    Question Can 2021 GMC 2500 Diesel towing Solitude 378MBS?

    Hi all, I am new to GD forum. We are searching for 5W for a while and love Solitude 378MBS. 378MBS GVWR is 16800 lbs. We have a 2021 GMC 2500 Diesel. Base on the sticker, MAX FIFTH WHEEL HITCH is 18,500 LBS. MAX PAYLOAD is 3,563 LBS. Do you think it will be OK to tow 378MBS? By the way, we love to go to the mountains. Could you guys help with this? Thank you so much!

  2. #2
    Site Team Redapple63's Avatar
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    Unfortunately I think this rig will exceed your payload with just the pin weight at GVWR of the 5er. With the GVWR of 16800lbs of that rig you are solidly in dually territory.

    Good Luck.


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    2019 GMC 3500 SRW Sierra Denali Duramax
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  3. #3
    Site Team WhittleBurner's Avatar
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    Hi and Welcome, figuring towing capacities can be tricky. The thread below has plenty of info on how to figure the correct capacities for your truck.
    https://www.mygrandrv.com/forum/show...ing-Capability

    If it were me I wouldn't tow a trailer that size without DWR, some will say yes..it really is a personal safety choice you have to make once you are educated on tow capacities and real world pin weights
    Marcy & Gary
    2014 Grand Design - Reflection 303RLS
    2015 GMC Denali 3500 Duramax Longbed SRW
    2003 F350 - retired
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  4. #4
    Site Team Second Chance's Avatar
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    Moderator note: duplicate thread deleted and this one moved to Tow Vehicle sub-forum.

    Now... as others have said, at 16,800 lbs. GVWR, the 378MBS will put about 3,800 lbs. on the pin when loaded (advertised pin weights are dry/empty). As others have said, this is in dual rear wheel territory and not appropriate for a 3/4-ton truck. With fifth wheels, it's not about towing capacity, it's about payload. You may find this calculator useful:

    http://changingears.com/rv-sec-calc-...eight-fw.shtml

    Rob
    U.S. Army Retired
    Widowed and very happily remarried
    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

  5. #5
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    I have a 377MBS, prior model and my pin is 3400 loaded, no generator or W/D. I consider this trailer 3500 SRW, minimum DRW preferred.


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  6. #6
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    That rig is likely going to put 4K+ lbs pin weight on your tow vehicle. You have a very capable 2500 (technically based on your payload that GVW is in 3500 tax territory), but IMO as others said, you are into duality territory with that trailer. The numbers back that up.

    Since GM is giving real numbers on the 2500 now, and not just stopping at 10k GVWR (for taxes) like they did for years, you would be smart to stay within the ratings. The old ‘it can handle more than it says’ really doesn’t apply in this case.

    Are you new to camping or looking to upgrade? A lot of people buy the wrong first trailer - the going saying is that ppl buy one way too big, way too small (in either order), then the 3rd one is just right. Maybe pick out the smallest trailer you could live with, the largest (this one), and then one in between? If you aren’t new, disregard all of this haha

    In any case, congrats on the new truck! It may not pull this trailer, but it will still pull a heck of a camper.
    2019 Imagine XLS 17MKE (pre-murphy bed)
    2017 Ford F-150 XLT 5.0 Fx4
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  7. #7
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    Thank you so much!
    I will look into Reflection instead then. Do you think my truck can tow Reflection 31MB(GVWR 11995 lbs)?

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    Site Team Second Chance's Avatar
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    Quote Originally Posted by ethanwx View Post
    Thank you so much!
    I will look into Reflection instead then. Do you think my truck can tow Reflection 31MB(GVWR 11995 lbs)?
    Probably - but plug all the numbers into the calculator above and read the link that @WhittleBurner gave you.

    Rob
    U.S. Army Retired
    Widowed and very happily remarried
    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

  9. #9
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    My math says that *the 31mb puts 2400-3000lbs on the hitch. So definitely possible. If you load heavy and have a big family in the truck you could be tight on payload, but that’s just something to be aware of and pay attention to. I’ll let the actual 5th wheel towers chime in, but to me that’s a safe trailer with your truck.

    *edited
    Last edited by Stealth13777; 04-18-2021 at 02:38 PM.
    2019 Imagine XLS 17MKE (pre-murphy bed)
    2017 Ford F-150 XLT 5.0 Fx4
    Blue Ox WDH

  10. #10
    Site Team Second Chance's Avatar
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    Quote Originally Posted by Stealth13777 View Post
    My math says that puts 2400-3000lbs on the hitch. So definitely possible. If you load heavy and have a big family in the truck you could be tight on payload, but that’s just something to be aware of and pay attention to. I’ll let the actual 5th wheel towers chime in, but to me that’s a safe trailer with your truck.
    Your math is interesting. My 14K Reflection 337RLS put 3,000 lbs. even on the pin and our 15K Solitude 310GK-R puts 3,400 on the pin. Neither has/had a generator or extra batteries. There's no way the trailer the OP is considering will come in under 3,000 lbs. on the pin.

    Rob
    U.S. Army Retired
    Widowed and very happily remarried
    2012 F350 DRW CC LB Lariat PS 6.7
    2020 Solitude 310GK-R, MORryde IS, disc brakes,
    Sailun LRG tires, solar, DP windows, W/D
    (Previously in a Reflection 337RLS)
    Full time since 08/2015

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