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Old 12-18-2022, 07:59 AM   #1
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RV Weight Oddity

Thanks to everyone for all of the support via this forum!! Priceless info!

I have new 2022 Phaeton 40IH bought on Nov 4th. It is the all electric, 450 HP version with all hydraulic slides. I weighed the coach at a CAT Scale in Hamilton AL. The coach was loaded for camping and full of gas & DEF, prob 25 gal of fresh water, black/grey tanks mostly empty. It also had my 2017 2 door Jeep Wrangler hooked up.

I have attached the print out from the scales. I also attached a screen shot of the tag affixed to the door concerning the vehicle weight.

Scales show an RV weight of 36,540. The Tiffin spec off of the door door tag is 39,600. That is a 3060 lb difference!! Does having the tow impact the accuracy?? While I am happy it weighs less for many reasons, I find it 'ODD' that the weight was not closer and even OVER the posted spec from Tiffin since we were loaded up.

I would appreciate your thoughts on this as I am sure there is a reasonable explanation.

I intend to split the axle weights to determine the proper tire pressure, but not sure of myself due to the weight discrepancy.

Thanks in advance for your feedback!!!
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Old 12-18-2022, 08:06 AM   #2
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The factory GVWR is your gross vehicle weight rating, not your vehicle's actual weight. It is the maximum your vehicle is allowed to weigh when fully loaded. Having a big margin like that is good, very good.
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Old 12-18-2022, 08:32 AM   #3
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The number that is missing is Gross Combined Weight Rating (GCWR). That is what includes the trailer. I'm guessing according to Tiffin website that this rig is going to have a GCWR of 49600 lbs.

Against the GVWR, there appears to be a margin of about 3500 lbs. That's good.

Against the GCWR, there appears to be about 10000 lbs margin. That's good too.
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Old 12-18-2022, 08:41 AM   #4
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In addition to what bigb56 wrote, you most likely have another tag from Tiffin, telling you the OCCC capacity of the coach. The OCCC is the amount of people gear and everything you put in the coach without exceeding the GVWR. Subtracting the OCCC amount from the GVWR will give you the weight of the coach when it left the factory.

You think you're fully loaded for camping. I weighed my MH after having it for about 3 months and thought I was fully loaded for camping. I weighed it again over 5 years later and it had gained over 1,100#. I put on a few pounds in that amount of time, but nowhere near that much.
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Old 12-18-2022, 03:20 PM   #5
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Thanks!

Thanks for the feedback and wonderful education!

I found another document (attached) in the back closet that speaks to the GCWR & GVWR. Sounds like I am great on all fronts. Now 'should I tell the wife we have a lot more space???.... haha!

Thanks again!
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Old 12-23-2022, 05:28 PM   #6
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Quote:
Originally Posted by RollinTiffy View Post
Thanks for the feedback and wonderful education!

I found another document (attached) in the back closet that speaks to the GCWR & GVWR. Sounds like I am great on all fronts. Now 'should I tell the wife we have a lot more space???.... haha!

Thanks again!
Having had towable for many years I thought it was great having around 3,200 lbs of OCCC with our Open Road. That went quick. We upgraded to a Phaeton 40QKH and now have nearly. 7,000 lbs of OCCC! I’ve *challenged* my wife to try and max us out. She wants to expand her rock collection.
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Old 12-23-2022, 07:00 PM   #7
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Quote:
Originally Posted by 04266832 View Post
Having had towable for many years I thought it was great having around 3,200 lbs of OCCC with our Open Road. That went quick. We upgraded to a Phaeton 40QKH and now have nearly. 7,000 lbs of OCCC! Iíve *challenged* my wife to try and max us out. She wants to expand her rock collection.


Be careful what you ask forÖ I did the same thing and now my wife is plotting her storage! HAHA!
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Old 12-23-2022, 07:13 PM   #8
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Here is part of your answer.....


Holding Tanks
Total Fresh Water Tank Capacity
100.0 gal.

Total Gray Water Tank Capacity
100.0 gal.

Total Black Water Tank Capacity
55.0 gal.


From your post, you mentioned 25g of fresh water in your tank and your waste tanks mostly empty.



Soooo, you have available...
- 75g of water carrying capacity: ~600lbs
- 100g of gray water carrying capacity: ~800lbs
- 55g of black water carrying capacity: ~500lbs


That's almost 2000lbs more weight you'd be carrying if those things were full.


Probably unlikely that you would have ALL of those things and full gas tank, etc all at the same time. But it's good to know that even if you did you'd still be a little under the max weight.


Safe travels!
Chris
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Old 12-27-2022, 11:50 AM   #9
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The correct tire pressure should be selected by axel weight. I would think that you have Michelin tires, look at Michelin's chart (on line) for your tires, and inflate them to what the chart states. The tires on our 2021 35CP were very over inflated. Much better ride with proper inflation. Stan
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Old 12-28-2022, 07:57 AM   #10
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Your GVWR is exact the GAWR's added up, and this means that its verry hard to use the full GVWR without overloading one of the axles, mostly rear. Mostly GAWR's added up, is a bit more, so you can shift the loads a little.

Once you want to know the tire pressures needed, as 36PFT already pointed to, I can help you with that.

Can make a pressure/axleload list for you, with reserve build in, and using maxload of tires x2 for the front singleload-axle, and x4 the maxload for dual load rear axle.
Then you only have to determine the axleloads, as you did by weighing, acurately, and search them back in the list.

If you want me to make that list, give next data of tires, mostly can be read from sidewall.

1. Maxload or loadindex, for single and dualload.
2. Kind of tire to determine the reference-pressure, but psi behind AT is better.
3, speedcode of tires.
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Old 12-29-2022, 07:13 AM   #11
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Tire Pressures Based Upon Axle Weights

This is how I am determining proper tire pressure based upon my recent weights. Please 'weigh' in on accuracy/assumptions (pun intended..). (Tire type and Michelin chart attached.)

Front Axle - 13,480/2 = 6,740
Rear Axle - 23,060/2 = 11,530

Based upon the attached Michelin chart, I see 100 psi for the front and 95 psi for the rear.

I plan to go 5 psi above those psi's (105 - front, 100 - back) as we are in the process of going full time for a while and adding another 1000-1500+ lbs of weight is a lay down, plus my wife and I were not in the coach when it was weighed. Make sense??

jadatis, being a neophyte on all things tires, your post is a little above my pay grade of understanding. I would like to understand it better, though. Does the photo of my tire help you know what I have??
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Old 12-29-2022, 02:24 PM   #12
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Strange is that the list gives maxload at 120 psi, while on tire, ( if I read it right) 125psi.

Checked that list to be made with the european formula, used for decades for all kind of tyres, and since 2006 also in US, only for P-tires.
So not bad, but no reserves included.

Made you a list in wich I give 90% of calculated axleload for the psi.
In front for your front tires so single load axle, using 2 x 7826lbs (LI 152), and behind for rear dualload axle, so 4x 6945lbs used( LI 148).
So you only have to read the axleloads, I did all the rocket science for you.
My suspicion is that max speed of this tire is 75mph, but if you also find it on sidewall, give it.

Comfortborder I determined 90% used of loadcapacity for 99mph. But list gives it for that max of most likely 75mph.
That means that pressures can even be higher with still acceptable comfort.

Then my list comes to front 120 psi and rear 115psi, and still comfortable

Front singe/ cold psi/Rear Dual
Axleload/ advice/ Axleload
4570 lbs/ 37 psi / 8111 lbs
4794 lbs/ 39 psi / 8509 lbs
5017 lbs/ 41 psi / 8905 lbs
5240 lbs/ 43 psi / 9301 lbs
5463 lbs/ 45 psi / 9696 lbs
5684 lbs/ 47 psi / 10089 lbs
5906 lbs/ 49 psi / 10482 lbs
6127 lbs/ 51 psi / 10874 lbs
6347 lbs/ 53 psi / 11266 lbs
6567 lbs/ 55 psi / 11656 lbs
6787 lbs/ 57 psi / 12046 lbs
7006 lbs/ 59 psi / 12435 lbs
7225 lbs/ 61 psi / 12824 lbs
7444 lbs/ 63 psi / 13212 lbs
7662 lbs/ 65 psi / 13599 lbs
7880 lbs/ 67 psi / 13986 lbs
8097 lbs/ 69 psi / 14372 lbs
8315 lbs/ 71 psi / 14758 lbs
8532 lbs/ 73 psi / 15143 lbs
8748 lbs/ 75 psi / 15527 lbs
8965 lbs/ 77 psi / 15911 lbs
9181 lbs/ 79 psi / 16295 lbs
9396 lbs/ 81 psi / 16678 lbs
9612 lbs/ 83 psi / 17060 lbs
9827 lbs/ 85 psi / 17442 lbs
10042 lbs/ 87 psi / 17824 lbs
10257 lbs/ 89 psi / 18205 lbs
10472 lbs/ 91 psi / 18586 lbs
10686 lbs/ 93 psi / 18966 lbs
10900 lbs/ 95 psi / 19346 lbs
11114 lbs/ 97 psi / 19726 lbs
11327 lbs/ 99 psi / 20105 lbs
11541 lbs/ 101 psi / 20484 lbs
11754 lbs/ 103 psi / 20862 lbs
11967 lbs/ 105 psi / 21240 lbs
12180 lbs/ 107 psi / 21618 lbs
12392 lbs/ 109 psi / 21995 lbs
12605 lbs/ 111 psi / 22372 lbs
12817 lbs/ 113 psi / 22749 lbs
13029 lbs/ 115 psi / 23125 lbs/ weighed rear
13241 lbs/ 117 psi / 23501 lbs
13452 lbs/ 119 psi / 23876 lbs/weighed front
13664 lbs/ 121 psi / 24252 lbs/GAWR rear
13875 lbs/ 123 psi / 24627 lbs
14086 lbs/ 125 psi / 25002 lbs/ referencepress
14297 lbs/ 127 psi / 25376 lbs
14508 lbs/ 129 psi / 25750 lbs
14719 lbs/ 131 psi / 26124 lbs
14929 lbs/ 133 psi / 26497 lbs
15139 lbs/ 135 psi / 26871 lbs/ Gawr front
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Old 12-29-2022, 04:02 PM   #13
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Correction, M speedrate is max speed 130kmph/ 81mph.
Read over it, sorry.
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Old 12-30-2022, 06:52 AM   #14
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jadatis: So this is saying at 75 mph, my front pressures should (or could) be 120 psi front and 115 psi rear or is that MAXIMUM cold tire pressure? The Michelin charts shows 100F and 95R based up Ĺ of the axel weights. Apologies but I am just not following what you are saying and where I should be setting my tire pressures. My plan is to set the 5 psi above the Michelin advised psi due to additional weight that will be added to the coach.
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