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Omodan's avatar
Omodan
Explorer
Nov 04, 2014

GVWR Calculation Question

I am hoping for clarification that I am calculating my payload correctly.

I am planning on purchasing (in process of this week) a 2014 Jayco Jay Flight 28BHBE travel trailer. I don't have the physical trailer yet; so ill be using their online posted weights for my planning purposes. This trailer is listed as being 6,495 unloaded weight, 700 dry hitch weight, and a maximum GVWR of 9250 lbs. The model I am purchasing is fairly loaded though with the fiberglass sides, and extra odds and ends added. I am a fairly typical family, so I probably wont add more than 1000 lbs. of gear/water to the trailer when towing. So I am assuming a 8,000 lb total trailer weight.

My tow vehicle is a 2014 Tundra 5.7L Double Cab 4x4 (TRD). It's owner's manual and door sticker differ; so ill post both. The manual states my model/make should have a base curb weight of 5505 and the GVWR is 7100. This should give a payload capacity of 1595 lbs. The door sticker agrees on the 7100 GVWR but states I have 1420 lbs payload capacity. The towing capacity is listed at 9900 lbs for my make/model on both the sticker and the manual.

Additional weight considerations on my TV are that I also have a ARE Z Series Camper top, weighing at 190 lbs and a spray in bed liner. Other than that, it would be my wife and I at 150lbs each and my two kids are 30 lbs each. You also will have car seats, at roughly 15 lbs each and the usual travel cargo. The vehicle also holds 27.5 gallons of fuel.

I have a weight distribution hitch and trailer brake controller. I also have all the added tow features/packages included from the dealer for my truck such as sway control, factory installed tow package, etc...

Now my question: Based upon the above; it appears I am over my GVWR despite being within the towing capacity. I should be fine being able to actually pull the trailer, but seems that I am well over my GVWR. I am figuring that by adding the weight for fuel, occupants, camper top, misc interior gear like car seats and backpacks, the actual WDH itself, and then the trailer hitch weight of 10% of anticipated trailer weight, so 800 lbs.

All the above is driving me to the conclusion that my vehicle can not handle this trailer and that I should narrow my focus to a ultra light and preferably the 22 to 25 foot range. Am I missing something? Is my tow vehicle that limited or do the WDH and other safety items help mitigate my perceived GVWR being exceeded? Lastly, should all of the items that I listed above be added together to see if I have met the GVWR or were some of those already included in the base curb weight?

Sorry for the long question/details but wanted to make sure I am figuring things right before buying this trailer and potentially subjecting my family to a hazard. Thanks.
  • Unfortunately, you are experiencing why most people who pull any sized trailer find themselves not only over the payload capacity but also the RAWR and GVWR of a 1/2 ton truck. They all have wonderful engines with lots and lots of power/torque, but the frame, brakes, axles, etc are just not up to par. Also, 10% of the trailer's weight is typically on the light side. That's why most people will go with 12 to 15 percent of the trailer's GVWR. That allows you some give and take in your figures.

    Can you pull this trailer? Probably. Should you? Probably not.

    I'm with the others....find a lighter, not necessarily shorter, trailer.

    Good luck.

    Ron
  • For my F-150 the max cargo is 1411 lb. on the door post. From this I have to subtract;
    • Two adults and a dog – 500 lbs.
    • Fiberglass cap – 250 lbs.
    • Tools, chairs and camp gear not in TT – 100 lbs.
    • WD hitch – 70 lbs.
    Total weight 920 lbs. This means my TT tongue weight should be no more than 491 lbs.

    I am told that the WD hitch shifts about 15 % of the weight back to the trailer so I may have an additional 200 lbs. to play with but experience has shown that the 200 lbs. disappears pretty fast with various odds and ends.

    I haul a 5000 lb. dry weight trailer and when loaded I am probably at or a bit over the recommended limit.

    You can judge accordingly but I usually figure a half ton to be the TV for 5000 lbs. or less.
  • There is only one sure way to find your payload capacity. Payload = GVWR - Actual (loaded) vehicle weight. Weighed at a scale.
  • The payload sticker on the door jam says 1420#. Minus the 190# for the camper top leaves you 1230# for anything else (driver, passengers, seats, tongue weight, WD hitch and etc).

    8000# trailer at 12% tongue weight is 960#. Subtracted from the remaining 1230# of payload leaves 270# of payload. subtract passengers 360# and you are over the payload.
  • I think you're spot on your evaluation. With the exception of the tongue weight. My guess is it will be closer to 1000lbs. Which puts you in a deeper whole. Also the door sticker is the weight as it leaves the factory as I understand. So the 1420lbs is what you have. I see it as you're about 325lbs over GVWR.
    TW 1000
    Family 360
    ARE 190
    TT battery 45
    Propane 40
    Front cargo 200
    WD hitch 100
    Total 1745lbs.

    While being over GVWR by 325lbs isn't the end of the world, and doable if you're short tripping it on weekends. I would be concerned though that you're close or over and we're just using hypothetical numbers. They could be lower or higher. Not sure if the FG sided TT is less in weight or not. That could be a plus. Might be worth a call to Jayco.

    I ran into the same thing when we had our TT and F150. I even had 1857lbs of payload. Snugtop cap plus all the stuff in the truck and a 7300lb TT with 900lb TW put the truck right at the 4050lb RAWR.
  • Without doing any math, I'd look for a lighter trailer. 4 tons is a fair load to pull and stop. Good luck.