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08-20-2018, 11:54 AM
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#1
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Junior Member
Grand Design Owners Club
Join Date: Feb 2017
Location: Sicklerville, NJ
Posts: 28
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How to figure out the the true pin weight of a fifth wheel on the back of your truck
I would like to know how to figure out the true weight of the fifth wheel pin “gvwr 14000lbs”on the back of my 350 single wheel?
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08-20-2018, 12:22 PM
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#2
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Senior Member
Join Date: Aug 2010
Location: Olathe, Kansas
Posts: 329
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Go weigh your truck and then go hook up your 5th wheel and go back and weigh them combined. Compare the difference and that will tell you what the pin weight is.
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08-20-2018, 12:24 PM
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#3
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Junior Member
Grand Design Owners Club
Join Date: Feb 2017
Location: Sicklerville, NJ
Posts: 28
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Thanks
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08-20-2018, 12:25 PM
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#4
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Senior Member
Join Date: Nov 2015
Posts: 26,848
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True pin weight can ONLY be achieved by getting truck/trailer weighed
Load up 'camp ready' (all people/pets/stuff) and go to Weigh Scales
Weigh truck/trailer combo....drop trailer and get truck only weights
Then you will can figure out TRUE WET PIN WEIGHT
At CAT Scales
First weigh ticket is $10/$12
Second reweigh within 24 hrs is FREE
(one trip...just drop trailer in parking lot and go reweigh)
Otherwise.....guesstimate is best one can do
Look at 5th wheel 'UVW' (Dry weight of trailer) and the Pin Weight (Dry Pin)
Calculate what percentage Dry Pin Weight is for the UVW
Using that percentage calculate guesstimate wet pin weight for Trailer GVWR
OR
Use 20%, 22%, 25% of GVWR for guesstimates of wet pin weight
W/O weighing it is strictly and educated guess.
I have a 3500 SRW and a 14K 5th wheel (13,873# actual weight when fully loaded)
WET PIN is 3080#---a tad more then 22%
Trucks RAWR is 6200# -- I am RIGHT at that rating and under Rear Tire Max Load Ratings
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Dodge 3500 w/Tractor Motor
US NAVY---USS Decatur DDG-31
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08-20-2018, 12:48 PM
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#5
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Senior Member
Join Date: Jan 2017
Location: "Murvul", TN
Posts: 1,666
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Check out this link. RV Safety|RV Towing Calculator|Tow Ratings|GCWR
Click on the 4 Step Weight Safety Plan at the top of the page and follow the instructions and steps.
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2018 Grand Design Momentum 394M Toy Hauler
Excessive Payload Capacity is a Wonderful Thing!
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08-20-2018, 05:10 PM
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#6
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Senior Member
Ford Super Duty Owner
Join Date: Feb 2017
Location: Manhattan (Little Apple) Kansas
Posts: 2,544
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Here is another good video...
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08-20-2018, 05:15 PM
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#7
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Senior Member
Join Date: Feb 2016
Posts: 691
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Cat scale is your friend
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08-20-2018, 07:30 PM
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#8
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Senior Member
Join Date: Aug 2004
Location: Wherever we are
Posts: 4,288
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Weigh the truck with the trailer on it; weigh the truck without the trailer. Bingo, difference on rear axle is the pin weight. Won't do much good if you do the weights without being loaded for camping...
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08-20-2018, 08:11 PM
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#9
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Member
Join Date: Jan 2017
Location: Cleveland, Ohio
Posts: 35
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You can also buy a small hydraulic scale from Harbor Freight and weigh the pin when it is sitting on your fifth wheel hitch. They don't cost very much and I believe they go to 5,000 lbs.
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08-20-2018, 08:49 PM
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#10
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Senior Member
Join Date: Jan 2017
Posts: 509
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A free way is to Find a closed DOT truck house, they leave the scales turned on whether the scale house is “open” or “closed, second way would be a scale at a truck stop, but that will cost per trip.
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2012 RAM 3500 dually
06 ragen 3506 BH
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08-20-2018, 08:52 PM
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#11
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Senior Member
Join Date: Jan 2017
Posts: 509
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Quote:
Originally Posted by wingnut60
Weigh the truck with the trailer on it; weigh the truck without the trailer. Bingo, difference on rear axle is the pin weight. Won't do much good if you do the weights without being loaded for camping...
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You need to weigh the front and rear axle difference NOT just the rear axle
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2012 RAM 3500 dually
06 ragen 3506 BH
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08-21-2018, 08:54 AM
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#12
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Senior Member
Join Date: Jul 2007
Posts: 228
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Quote:
Originally Posted by gordofuchs
You can also buy a small hydraulic scale from Harbor Freight and weigh the pin when it is sitting on your fifth wheel hitch. They don't cost very much and I believe they go to 5,000 lbs.
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Got a link or model number?
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2017 Eagle HT 27.5 RLTS
2011 Chevy 2500HD Duramax Crew Cab 4WD
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08-21-2018, 11:45 AM
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#13
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Senior Member
Join Date: Apr 2015
Posts: 1,442
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Quote:
Originally Posted by gordofuchs
You can also buy a small hydraulic scale from Harbor Freight and weigh the pin when it is sitting on your fifth wheel hitch. They don't cost very much and I believe they go to 5,000 lbs.
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I would not trust any number coming from a Harbor Freight tool. Especially when it comes to towing. 
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08-21-2018, 03:02 PM
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#14
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Senior Member
Join Date: Jul 2015
Location: Currently; SW Cali. Sunny & warm!
Posts: 1,323
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Quote:
Originally Posted by raineman
I would not trust any number coming from a Harbor Freight tool. Especially when it comes to towing. |
LOL, oh come on, why so skeptical?...
(  please note my sarcasm) I do purchase some expendable items there, but yeah, let the buyer be-ware.
There really is more value in knowing all your axle weights, than just a static pin weight. Particularly your tandem axle comparisons. There are many towing trailers nose high etc..
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