Voltage GVWR/Tires Under Rated - Dutchmen Owners

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Old 08-26-2019, 03:23 PM   #1
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Voltage GVWR/Tires Under Rated

My 2018 Voltage 3605 came with Westlake 235/80R/16E tires and 7k axles. After a blow out and damage, I decided to swap tire with a set of Goodyear Endurance 235/80R/16E tires. Believing the Goodyear set would be an upgrade of an equal rated tire. Lesson learned was the Westlake had a weight rating of 3520 lbs and the Goodyears are rated at 3420lbs. Goodyear is upgrading my tires to G rating to increase the load, but it brings up the point of just because tires are rated the same do your research.

Please correct my math: Voltage 3605 has a 16800 GVWR. If I have 2 axles at 7k (14000lbs) and 4 tires rated to carry 14800 lbs from the factory, Is Dutchman selling dangerously under rated suspension and tires?
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Old 08-26-2019, 05:39 PM   #2
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You would need to take your hitch weight into account. GAWR plus the hitch weight would equal your GVWR. This is because your tires and axles do not carry all the weight, your truck is responsible for some of it also.
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Old 08-26-2019, 06:31 PM   #3
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You would need to take your hitch weight into account. GAWR plus the hitch weight would equal your GVWR. This is because your tires and axles do not carry all the weight, your truck is responsible for some of it also.
Ive read to take 15% off the total. Is that accurate for hitch weight? Or is there a specific number
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Old 08-26-2019, 07:15 PM   #4
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Fifth wheels are 15% to 25% and travel trailers are 10% to 15%. This is outlined in the owner's manual.
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Old 08-26-2019, 07:57 PM   #5
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Thank you for the help. Just get so many opinions in General RV forums that are erroneous. I had guy telling me that I couldn't add anything to my rig because the tires could only carry 14k. Swore he was a career mechanic and I was going to kill someone on the road.
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Old 08-26-2019, 10:08 PM   #6
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If you really wanna know how much hitch weight you have... tow your rig to any truck stop with a CAT scale.

Pull across the scales twice (doesn't matter what order)

1) Once with just your truck

2) The other with with both the truck & RV


When done, you will receive 2 weigh tickets like shown below:

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The added weight to your truck axles (Steering axle + Drive axle) is your hitch weight.

In the examples above... this is my Ford F-450 dually. My truck alone had:

5600 on the Steering axle, and 4140 on the Drive axle, for a Gross weight of 9,740 lbs.

When hitched to the RV:

5640 on the Steering axle, and 7160 on the Drive axle. That's an addition of 3,060 lbs... which is my hitch weight.

The Gross weight of my truck & RV combined was 26,640. If we subtract the gross weight of the truck alone (9,740)... we're left with 16,900 lbs... which is the gross weight of my loaded RV.

Finally, to cross check... if we subtract the 3,060 lbs of hitch weight from the 16,900 lbs gross weight of the RV... we're left with 13,840 on the RV axles... which equals the amount shown on the weight ticket

13,840 divided by 2 axles = 6,920 lbs per axle... and if we further divide that by 2 tires/axle, we get 3,460 lbs supported by each tire.
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Old 08-26-2019, 10:44 PM   #7
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I agree - CAT scale.
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Old 08-27-2019, 12:32 AM   #8
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Yes cheap tires our voltage I doubt has 4000 miles we live by St. Petersburg and usually keep camper in Arcadia on a site occasionally we will bring it home to use at Disney ft wilderness our last trip to Disney three weeks ago got home had bubble on sidewall (blessed we got home) I don’t rub curbs have been wanting to put sailun load range g now I will. We usually carry three full size four wheelers or the golf cart. the factory tires suck mushy tire soft sidewalls. All our best Largo fl
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Old 08-27-2019, 02:28 AM   #9
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CAT Scale it is. Thank you for the thorough explanation versus what Ive gotten in other forums
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Old 08-27-2019, 12:34 PM   #10
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Originally Posted by Jcop243 View Post
CAT Scale it is. Thank you for the thorough explanation versus what Ive gotten in other forums
CAT scales are the definitive answer. You have real-world numbers to work with.

If you really want to drill down the numbers find a shop with individual wheel scales.
I did this with a single axle pop up I had years ago that kept wearing out left side tires. Found out it was overloaded on the left side due to poor design.

In answer to your original question; the tires from the factory are barely adequate, not to mention the fact you lose load capacity as the tires age. IIRC it is somewhere in the 2%-5% per year range. So theoretically a 4 year old tire could be running 20% under capacity.

Aaron
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