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sgfrye's avatar
sgfrye
Explorer
Nov 17, 2017

Cat scale analysis. Question

Finally was able to get to a cat scale to weigh rig. Weighed our truck first. Ford F-250 super duty with wife and I ready to camp minus 4 small dogs they camp with us always. 40 lbs total for them. Total steer axle 3800 and rear axle 2840. lbs. total 6640 lbs. then I weighed truck and TT 33 ft wildwood. With WDH hooked up 3420 steer axle and rear axle 3920 lb. 3rd pad weight (TT 6300lbs) Total weight 13,640 lbs. my question so I understand. The WDH transferred 700lbs to tow vehicle? I did not weigh TT with WDH disengaged. My trucks
Gcwr is 19k lbs so I know I'm good there, and it's gvwr is 9k The TT gvwr is 7720. We pack light and tow with empty tanks. Just trying to get an idea of what extra weight we could add if needed.
  • I like the front axle to have the same weight, with and without trailer...

    so 3800.. without and with trailer.. up the chain link by one... or 2 if needed.

    based on you without weight.. its a Gas 6.2L 4 wheel drive ?
    or a fully loaded 2 wheel drive :)
  • I echo the suggestion of cranking up the WD hitch a chain. You want to try to add as much of the weight back to the steering axle as you can. You're about 400lbs light there.

    You don't HAVE to go back immediately to reweigh. If you are on level ground, measure the distance from ground to top of your front wheel well. Then, hook up trailer and WD hitch and adjust until you get the same front wheel well measurement. You'll be dang close weight wise there. Then, next time you're near a scale, you can double check.

    Mike
  • thanks for all the input guys. i always like to hear from experience. im still learning. after about 1500 miles of towing i like the wdh and sway control setup. living in north carolina we are fortunate to have mountains and coastline and ive towed this rig in both situations. it tows great. on a long trip my wife will take her turn driving and she feels comfortable with it also. so far we have done 2 and 3 night trips but in the near future will be doing longer trips. i wanted to get a general estimate on how much weight i can add. the closest scale is 1 1/2 hour round trip from my house so not really looking to weigh often. also forgot to mention that on the scales i bubble level checked tt and it was level front to back and side to side.
  • The weight of my TT can vary as much as 400 lbs. depending on how much gear I need for each trip.

    The sticker on the door jamb should give you the weight of your unloaded truck and it's max cargo capacity.

    The combined axle weights of the truck with the TT attached will tell you how much weight you added to the truck when you are loaded for the road.

    As long as the weight increase does not exceed the trucks max cargo and each axle is within it rating, you should be good to go.

    The change in truck weight when the TT was added gives you the amount of tongue weight that is transferred by the WD hitch to the truck.
  • Sitting on a plane right now. Here's a quick look. Will follow up when landed. Your numbers look perfect. (This is from a spreadsheet I built using numerous CAT scale receipts to validate). Disregard numbers in parentheses as those are for my truck/trailer. That left-hand column are your numbers.

    13,640 Gross Weight (Max 19450. from scales receipt)
    6,640 Truck baseline weight (7580 unloaded/8000 loaded)
    3,420 Steer Axle Weight (Max 4900. from scales receipt)
    3,920 Drive Axle Weight (Max 4900.from scales receipt)
    6,300 Trailer axle weight (Max 10200. from scales receipt)
    700 Tongue Weight (Max 1260. Calculated. Do not change)
    7,340 Truck actual weight (Max 8800. Calculated. Do not change)
    7,000 Trailer Gross Weight (Max 10995.Calculated. Do not change)
    10% % Tongue Weight (Calculated. Do not change)
  • Finally was able to get to a cat scale to weigh rig. Weighed our truck first. Ford F-250 super duty with wife and I ready to camp minus 4 small dogs they camp with us always. 40 lbs total for them. Total steer axle 3800 and rear axle 2840. lbs. total 6640 lbs. then I weighed truck and TT 33 ft wildwood. With WDH hooked up 3420 steer axle and rear axle 3920 lb. 3rd pad weight (TT 6300lbs) Total weight 13,640 lbs. my question so I understand. The WDH transferred 700lbs to tow vehicle? I did not weigh TT with WDH disengaged. My trucks
    Gcwr is 19k lbs so I know I'm good there, and it's gvwr is 9k The TT gvwr is 7720. We pack light and tow with empty tanks. Just trying to get an idea of what extra weight we could add if needed.


    If it was my set up I would tighten up a little on the hitch. You took off almost 400 pounds from the steer axle and added almost 1100 pounds to the rear axle. I would look at maybe 200 pounds more on the front axle and see how it tows. If I am reading your numbers correctly you are at 7340 for the truck when hitched and 6300 for the trailer. This is the total you produced that is 13,640. If 700 of those pounds are tongue weight from the trailer and your trailer has a gross weight rating of 7720 then you are really at around 7000 pounds for the trailer. As you indicated that you travel light you have very little room left when adding water at 8.3 pounds times your gallons that could easily leave you with less than 300 pounds to spare if your water tank is 50 gallons. You said you don't travel with water and that is probably good for your 'reserve' calculations. Part of the tongue weight could be the weight of the hitch. It probably would be best to weigh your trailer alone on the scales to get your real weight. If you subtract the weight of a hitch you could be near 600 or 625 pounds tongue weight, a little light for loading as you want more like 12.5 percent of total trailer weight on the hitch.