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Old 02-13-2020, 04:34 PM   #29
JDT
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I weighed mine last summer on our way out of town, fully loaded for a two week trip. I had 13,250 on the axles and 3050 on the hitch. I can't remember but I think 80 psi was for that weight but I do run 90, which like I said, seems to be the sweet spot.

Off subject, but my hitch weight was only 18.7% of the total which in my mind is a little light. I'm not sure if the 20% thing is an absolute or just a target. I'm also not sure how that affects the ride but I would think a lighter pin weight might contribute to some bouncing at the hitch, which we had with the Winslow when we had our first truck, a 3500 GMC single rear wheel short bed. It went away when I simultaneously got a dually and an air ride hitch. I'm anxious to see how my new set up does (truck and hitch). The Goose Box weighs 110 pounds more than the Demco box I took off so I should be up to 3160, or 19.3%, assuming the whole 110 pounds goes to the hitch weight. A little closer to the magic 20%. I'm sure having a rear kitchen model with some heavy appliances at the rear makes my pin weight a little lighter than a mid kitchen model.

On edit, I missed seeing the load inflation chart you posted, Brad. I tried to read but the print was too small for these older eyes of mine.
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Old 02-13-2020, 04:49 PM   #30
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Quote:
Originally Posted by BRS50 View Post
I did find the Hankook load inflation chart in their catalog. With a 16k# trailer minus 20% pin weight I've got about 3200# per tire and could go as low as 80psi on this chart. I'm thinking 90 psi might be the way to go.
Quote:
Originally Posted by CARLnJANIS View Post
Oh, you beat me to the punch. Just noticed you found the chart. I started my post about a half hour ago and had to walk away for a several minutes. Good for you.

X2 what Jim said.

Also, you need to remember, the trailer in question in the "etrailer" article was a pop-up with a stated 2,900 lbs GVWR. You need to compare apples to apples. Your trailer's GVWR is 6 times that of the pop-up. Your trailer's approx. cargo payload, 4,600 lb., is over 1 1/2 times the pop-ups GVWR.

Your 5th-wheel is in a very different class than a pop-up trailer and your EXCEL is in a higher weight class than the majority of 5th-wheel trailers. Your 31' trailer is heavier than some of the mass marketed brand's larger models. In fact, the pop-up trailer in the aforementioned article, has more in common with a car, weight-wise, than a 5th-wheel.

Your trailer has a combined axle weight of 14,000 lbs for a single axle weight of 7,000 lbs and a single tire of 3,500 lbs. The TH22 max inflation is 125 psi for a tire load of 4,805 lbs. Your tires at 125 psi, need 1,305 more pounds/tire for optimum tire life and performance. I would try to find a load/inflation chart for the Hankooks and adjust the inflation pressure to a load of 3,500 lbs. You will probably find the inflation pressure to be around 80 to 90 psi.

Please post what you found for your trailer weight.

Carl
Quote:
Originally Posted by JDT View Post
I weighed mine last summer on our way out of town, fully loaded for a two week trip. I had 13,250 on the axles and 3050 on the hitch. I can't remember but I think 80 psi was for that weight but I do run 90, which like I said, seems to be the sweet spot.

Off subject, but my hitch weight was only 18.7% of the total which in my mind is a little light. I'm not sure if the 20% thing is an absolute or just a target. I'm also not sure how that affects the ride but I would think a lighter pin weight might contribute to some bouncing at the hitch, which we had with the Winslow when we had our first truck, a 3500 GMC single rear wheel short bed. It went away when I simultaneously got a dually and an air ride hitch. I'm anxious to see how my new set up does (truck and hitch). The Goose Box weighs 110 pounds more than the Demco box I took off so I should be up to 3160, or 19.3%, assuming the whole 110 pounds goes to the hitch weight. A little closer to the magic 20%. I'm sure having a rear kitchen model with some heavy appliances at the rear makes my pin weight a little lighter than a mid kitchen model.

On edit, I missed seeing the load inflation chart you posted, Brad. I tried to read but the print was too small for these older eyes of mine.
Jim, it seems Brad beat us both to the draw. The 20% hitch/pin weight is a target. I have a lot in my basement and my pin weight is around 25%. I checked all the weight limits for trailer and truck and I am still well within the trailer and truck specifications.
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