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Old 12-20-2022, 07:18 AM   #1
TD7
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2023 GT7 36D7 Weight ?

So on the way home from taking delivery I stopped at a CAT scale to weigh unit before loading it up. Unit has washer dryer and residential fridge. I weigh about 230lbs. and gas tank was full. My weights were steer axle 7520, drive axle was 13640, for gross weight of 21160. Seems light based on brochure stating GVWR of 24,000. Seems crazy that the brochure is off by almost 3k pounds. Has anyone else weighed their unit empty?. Just wondering if the GCWR will still be 30,000?
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Old 12-20-2022, 09:00 AM   #2
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That sounds about right for your coach being empty. That leaves you 2,840 for cargo, water, LP, personal belongings and passengers. Brochure is stating the 36D7 sits on a 24K chassis not indicating the "dry weight" of 24K. I hope I said that correctly?? As for your question on the 30,000 pound combination rating.... yes that is still correct. Hope this helps. Congrats on your new rig!
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Old 12-20-2022, 12:49 PM   #3
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GVWR and GCWR are unchanging numbers set by the manufacturer based on the chassis strength.

GVWR is the maximum the coach itself can ever weigh without exceeding its design limits. If the actual weight on the front axle plus the actual weight on the rear axle exceeds the GVWR number you're overloaded.

(GCWR minus GVWR) is the unrestricted towing weight, assuming a hitch of sufficient strength. That is the weight you could always tow horizontally but does not consider the "tongue weight" of what is being towed. The difference between GCWR and GVWR can never be used to add stuff into the coach, just for towing.

Note that the brakes on a vehicle are, per federal requirements, only designed and tested to safely stop the GVWR, never the GCWR. That's why anything being towed needs to have its own braking system.

On the door frame, usually, is a yellow OCCC sticker. It stands for Occupant and Cargo Carrying Capacity. The weight on the OCCC sticker is how much weight you can add in people, pets, stuff, and fresh water before the GVWR limit is reached. The OCCC sticker is created for each coach as it leaves the factory so they all can be different. That means the OCCC sticker takes the weight of all factory-installed options into consideration.

From the numbers you posted I'd guess your OCCC sticker shows you can add around 3,000 lbs. Is that correct?

Note that the US OCCC sticker shows the weight of full fresh water but does not include it because no one except you knows how much fresh water you'll need to carry.

In addition to the GVWR limit you have a GAWR limit, the Gross Axle Weight Rating. For the 24K GVWR chassis the front axle can never have more than 9,000 lbs on it and the rear axle can never have more than 15,500 lbs on it. You currently are well under those limits. Generally you'll see the weight of all stuff and water cause a rear axle weight increase, because almost everything is added behind the front axle.

Now you need to fully load the coach up with all people, full fuel, full water, full "stuff" and go over the CAT Scale again. If you're still under your GVWR and GAWR limits you're golden.

Some Georgetowns have as little as 1,800 lbs of OCCC. Those folks can overload their chassis fairly easily. I doubt you'll have that problem.

Hope this helps,

Ray
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Old 12-20-2022, 07:18 PM   #4
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Thanks NXR I'm doing exactly what you said weigh the vehicle loaded. I probably won't be over 1700 pounds with people and content. I also plan on pulling a Ford ranger behind it which is probably 4600 pounds max with fuel. I should be fine. I hope
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Old 04-04-2023, 08:21 AM   #5
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My 2023 GT7 36D7 with washer/dryer, two adults in front, one Standard poodle, pots and pans but little in fridge, some clothes, full fuel, full water, most of the standard gear in storage bays....

Front axle 7,840 lbs.
Rear axle 15,040 lbs.

That corresponds to 75 psi in the front, 80 psi in the rears as correct pressures.
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Old 04-04-2023, 11:01 AM   #6
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Quote:
Originally Posted by realshelby View Post
My 2023 GT7 36D7 with washer/dryer, two adults in front, one Standard poodle, pots and pans but little in fridge, some clothes, full fuel, full water, most of the standard gear in storage bays....

Front axle 7,840 lbs.
Rear axle 15,040 lbs.

That corresponds to 75 psi in the front, 80 psi in the rears as correct pressures.
I guess I’m learning something as I have never heard of running the tires low of psi ( do have 22.5 tires right?) so I went to etrailer and they said they following:

* *Available Within The Contiguous USA
Q & A Icon
Do Loaded Trailer Tires have Increase In Tire Pressure Compared to When Unloaded

Question:
Is the tire pressure supposed to measure with NO weight on the tire or under load? With 18,000# sitting on the tires there has to be a difference. Thanks
asked by: Rick
Expert Reply:
If the weight on a tire is heavy enough that the tire deforms then the pressure would increase with added weight. Under normal circumstances the pressure in a tire remains the same regardless if there is a load on them or not.

Since the volume of the tire does not change when under a load (only the shape) the pressure does not increase. In an extreme situation you may see an increase of around 1 psi.

So you will want to inflate the tires to their max psi rating when cold and you will be good to go.

So in closing I’ll keep mine close to 110 psi regardless of what I have inside my 36d7.

If you have a technical answer I’m all ears - love to learn new things.

Happy travels


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Old 04-04-2023, 11:32 AM   #7
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Quote:
Originally Posted by Jc4ut View Post
I guess Iím learning something as I have never heard of running the tires low of psi ( do have 22.5 tires right?) so I went to etrailer and they said they following:


So you will want to inflate the tires to their max psi rating when cold and you will be good to go.

So in closing Iíll keep mine close to 110 psi regardless of what I have inside my 36d7.

If you have a technical answer Iím all ears - love to learn new things.

Happy travels


Jimbo
Yes, the 36 D7 has 22.5 tires ( 255/80/22.5)
As far as technical goes I don't hold a degree. Always went by what the tire manufacturer ( or their Rep on racing tires ) has in their technical data information.
Many will swear to going by the maximum rating on the tire sidewall. Which is just fine if carrying maximum load as defined on that same tire sidewall.

There is much information available on manufacturers sites about the dangers of overinflation. Yes, that can be a cause of tire failure and handling issues!
Never heard of taking weight off the tire for proper inflation checks. I do know that most information is based on a 70F ambient temperature. Always measured when tires are "cold" in that they have not been run for several hours.
Here is a link to the actual Michelin RV tire data:
https://www.michelinb2b.com/wps/b2bc...s_Brochure.pdf
Page 27 shows the inflation chart for the tires I have - 255/80/22.5 XRV
I can tell you the vehicle information chart in my 36D7 says 100 psi. The tire says 110 psi maximum. I drove the coach with 110 on the test drive. Felt every single bump harshly. Had them go to 100 psi for delivery. Much better, but still harsh. I run 79 psi front and 84 psi rears-both about 5 psi OVER michelin recommended pressure for actual weights as measured. This is a cushion for natural air loss and odd loading that may occur on a trip.
My coach has so much better ride and handling at these pressures than the higher pressures. I am also sure it does not rattle, squeak, or pull walls off the frame as like it might with rock hard tires.
My statement about pressure is based totally on facts provided by the manufacturer. Any argument about pressure is with Michelin, not me! I will do what Michelin says to insure my tires are safe.
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