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  1. #1
    Fireside Member RJTimmer's Avatar
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    King Pin to Nose Cone Measurement - 388M

    Hoping someone would be able to take a quick measurement for me.

    I am wondering if you would be able to provide the swing radius dimension of the nose cone to the king pin on a 388M. I am setting up the B&W RVK3500 hitch in out truck this weekend, in anticipation of taking delivery of our newly ordered 388m next week Wednesday. I would like to not have to make adjustments to the hitch once i have it assembled.

    Thank you for your assistance.
    2012 Ram 3500 CCLB-CTD-DRW
    2016 Momentum 388M
    2015 Subaru Impreza
    1997 TJ Buggy

  2. #2
    Site Sponsor Dave and Monica's Avatar
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    Just a suggestion but as you're installing a B&W hitch with 4" of fore/aft adjustment, why not set it closest to the tailgate as long as you're not behind the rear axle centreline. That'll give you the most clearance possible between the front cap and truck cab and tailgate to front storage compartment. That's where mine is on a B&W Patriot hitch.

    Dave
    Dave and Monica - Gore Bay, Ontario
    Vitus the Hungarian Vizsla
    2014 Reflection 337 RLS #129
    2008 F250 V10 CC Lariat RWD

  3. #3
    Fireside Member RJTimmer's Avatar
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    while that would work with out question, it would be detrimental to MPG by allowing more air to impact the nose cone causing more wind resistance thus less fuel mileage and power load placed on the engine.

    I have a long box crew cab, so most likely i can go as far forward as the hitch will allow, with out issue, but I would rather know, than guess.


    just trying to get a leg up on the set up, versus having to do all of at the dealer on delivery day...
    2012 Ram 3500 CCLB-CTD-DRW
    2016 Momentum 388M
    2015 Subaru Impreza
    1997 TJ Buggy

  4. #4
    Seasoned Camper
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    I suspect with a long bed you won't have any issues if you use mid or forward position. On the 380th I am using highest height setting in middle position right above the axle. Working well with a B&W with plenty of turn radius and rail room. Trailer sits level nose to rear.

    Edit: thinking about mpg with different settings I can't imagine that much difference. Conceptually, there could be an mpg loss/gain but in real life situations with head or side winds I don't see it. I would love to see some hard numbers that shows if there are any gains made by moving kingpin forward. We are only talking about a few inches on a combination vehicle that is extremely lacking in aerodynamics.
    Just my .02.
    Chris & Honey & Mugsy
    2015 380TH -- Vin 573FM4221F1103069
    2015 Ram 3500 Dually

  5. #5
    Big Traveler RamGunner's Avatar
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    I'd recommend that you call B&W directly. I'm pretty sure they will recommend the forward position with a cc/lb. That will provide the greatest stability and load distribution.
    Editor - www.RamGunner.com and www.MomentumGunner.com
    2014 Ram 3500 Tradesman/CTD/AISIN/4.10/4WD/CC/LB/DRW/VHF/UHF/APRS/CB/SCANNER
    B&W RVK3600 5th Wheel Hitch/Reese 30140 Gooseneck Ball/Gen-Y HDGH-604 Receiver
    2016 Momentum 385TH (Internal LAN/AV Distribution/Polaris RZR 800 EPS/CB/SCANNER/VHF/UHF/APRS and HF for World-Wide Communications)

  6. #6
    Fireside Member RJTimmer's Avatar
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    I know the mpg difference should be minimal, and the load difference while towing into head wind shouldn't be that noticeable..... However with my old truck (f350 ecsb) & RV (2004 32' Coachman Chapparel) I could feel the difference between the 3 positions on the slider hitch. And had a noticeable mpg difference over long distances at highway speeds. Nearly .7mpg at 65mph.

    My goose pin is 51" from there cab, and 3" in front of the axle centerline. So if I set up the hitch to be 1" ahead of the axle center line I should be able to turn 90 degrees, with little concern. that leaves allot of space between the truck and nose cone, and most often I don't need or want to turn 90.... Seeing the hitch up as far forward and as low as possible also reduces the amount of chucking during gear changes and on less than good road surfaces.

    Sent from my Nexus 6P using Tapatalk
    2012 Ram 3500 CCLB-CTD-DRW
    2016 Momentum 388M
    2015 Subaru Impreza
    1997 TJ Buggy

  7. #7
    Seasoned Camper
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    .7 mpg would run around 7-8% which is pretty significant. Agree with more chucking/axle bounce the further back you set the kingpin.

    Have known several peeps that have tried an airfoil on the cab of the truck to improve fuel mileage while towing. Most remove it after seeing minimal gains in mpg.
    Chris & Honey & Mugsy
    2015 380TH -- Vin 573FM4221F1103069
    2015 Ram 3500 Dually

  8. #8
    Fireside Member RJTimmer's Avatar
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    Our 7.3 was load temperamental for sure. It pulled the RV fine, but got very thirsty when asked to make more than 18psi of boost. If it had to maintained that psi or above, it would lose 1 to 2 mpg no matter the load being pulled.

    Sent from my Nexus 6P using Tapatalk
    2012 Ram 3500 CCLB-CTD-DRW
    2016 Momentum 388M
    2015 Subaru Impreza
    1997 TJ Buggy

  9. #9
    Alaska
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    RJ, did you ever get an answer to this? I have the same Q pretty much. Same RV. I'm trying to mount a Superglide in a 6 1/2' bed and want to know how far forward I can go to get some Wt off the rear axle. Tks

  10. #10
    Left The Driveway
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    I am wondering the same. I just finished up my B&W 3500 and set it all the way forward/ highest position. With a long bed, I am more worried about the trailer riding level. We shall see this Friday after picking it up...
    2016 397TH
    2015 GMC 3500 DRW

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