Towing air pressure on 3500 Dually ?? - Dutchmen Owners

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Old 07-21-2018, 12:19 PM   #1
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Towing air pressure on 3500 Dually ??

I have a 2018 Ram 3500 DRW 4x4 and am towing a Voltage 3600 TH. I have been running what the sticker on the door panel says 80 front and 65 rear. Any opinions?
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Old 07-21-2018, 12:24 PM   #2
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Originally Posted by Sandrooney View Post
I have a 2018 Ram 3500 DRW 4x4 and am towing a Voltage 3600 TH. I have been running what the sticker on the door panel says 80 front and 65 rear. Any opinions?
Thanks,
SR
Same here with '05, 3500
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Old 07-21-2018, 01:11 PM   #3
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80 all round.
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Old 07-21-2018, 01:45 PM   #4
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Originally Posted by Sandrooney View Post
I have a 2018 Ram 3500 DRW 4x4 and am towing a Voltage 3600 TH. I have been running what the sticker on the door panel says 80 front and 65 rear. Any opinions?
Thanks,
SR
pump them up to what it says on the tires if you have changed the tires from the originals. If not, use the door sticker.
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Old 07-21-2018, 02:31 PM   #5
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There is a great forum for Ram that will have tons of information on this subject and there will likely be hundreds of members with your same truck and similar trailers. There are some super knowledgeable people over there and it seems like the members on that site are split between those that want to mod their trucks to make them faster (zero interest here) and those that tow a lot and even for a living. A few jerks too but just ignore them.

I believe the 3500 models allow you to adjust the TPMS settings in the truck so you can run lower without a warning if you are confident in what you want. In general the max psi setting will be on door sticker and those are the cold pressures you will need in order to carry the max weight. If you are under the max weight your truck is rated for you should/might be able to go with a lesser tire pressure. Most will tell you higher pressures translate to a rougher ride but obviously you need the minimum safe pressure to tow your trailer. I have a 2500 and always keep my tires at the door setting (65 front and 80 rear) for two reasons: first because I cannot adjust the TPMS settings and second because I donít want to have to worry about upping the pressures when I go get my trailer. Also, I guess there is a third reason too in that I know under inflated tires will wear poorly and I donít want to deal with that.

My truck is not an everyday driver so I am not striving for the perfect ride and donít mind the higher pressures.
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Old 07-21-2018, 02:55 PM   #6
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My door sticker says 70 front and 65 rear and the tires are wearing fine. I've weighed my 3600 and the actual weight on each tire falls into line with the air pressure chart for the tires - 65 PSI. There is no point running 80 PSI unless you like a really rough ride. BTW, when I weighed the truck and trailer the weight on the front axle was the same with and without the trailer.
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Old 07-21-2018, 05:51 PM   #7
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I guess with duallyís because there are four tires back there they can be lower than SRW rears. Makes sense as the load on each individual rear tire would be less.

Regardless, the point I was trying to make is that you can go lower than the recommended if you are towing/hauling less.
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Old 07-21-2018, 06:50 PM   #8
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My door sticker says 70 front and 65 rear and the tires are wearing fine. I've weighed my 3600 and the actual weight on each tire falls into line with the air pressure chart for the tires - 65 PSI. There is no point running 80 PSI unless you like a really rough ride. BTW, when I weighed the truck and trailer the weight on the front axle was the same with and without the trailer.
That's a well balanced rig...
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Old 07-21-2018, 10:17 PM   #9
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For what it's worth... the sticker on my F-450 states 75-fronts, and 60 in the rears. I've been running those pressures for over 4 years now with even wear & no issues.
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Old 07-22-2018, 03:38 AM   #10
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That's a well balanced rig...
Is it?

The weight on the rear axle has gone WAY up and the front hasn't changed? I'd say that's UNbalanced.

That's why 5th hitches are mounted in front of the rear axle - to distribute load to BOTH rear and front.
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Old 07-22-2018, 05:04 AM   #11
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Is it?

The weight on the rear axle has gone WAY up and the front hasn't changed? I'd say that's UNbalanced.

That's why 5th hitches are mounted in front of the rear axle - to distribute load to BOTH rear and front.
Well, I guess your the expert. I'll call the manufacturer of my hitch and tell them that someone on the internet says their installation instructions are not correct.
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Old 07-22-2018, 09:56 AM   #12
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Thanks for all the help. I will go by what the door sticker says.
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Old 07-22-2018, 12:04 PM   #13
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I agree with the sticker as well. My 18 Ram stays 80/65. The new Cummins is heavier and so is the Aisin transmission plus all this new electronic stuff..lol

The tires are designed for that pressure and with a dually the weight us shared, hence the 65 psi requirement.

Air them up!
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Old 07-22-2018, 12:11 PM   #14
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Originally Posted by joebedford View Post
Is it?

The weight on the rear axle has gone WAY up and the front hasn't changed? I'd say that's UNbalanced.

That's why 5th hitches are mounted in front of the rear axle - to distribute load to BOTH rear and front.
How can that be possible that his 5th wheel doesn't put any weight on the front axle unless his hitch is directly above the rear wheels and possible airbags.
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Old 07-22-2018, 03:27 PM   #15
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You'll not sucker me into a debate about my expertise. But go to the websites that talk about hitch installation and see what they say: the hitch should be slightly in front of the rear axle. Does that mean that no manufacturers put the hitch further back? I wouldn't know.
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Old 07-22-2018, 03:31 PM   #16
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Originally Posted by franktafl View Post
How can that be possible that his 5th wheel doesn't put any weight on the front axle unless his hitch is directly above the rear wheels and possible airbags.
It's not possible - his hitch has to be right over the rear axle.
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Old 07-22-2018, 04:14 PM   #17
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Originally Posted by joebedford View Post
You'll not sucker me into a debate about my expertise. But go to the websites that talk about hitch installation and see what they say: the hitch should be slightly in front of the rear axle. Does that mean that no manufacturers put the hitch further back? I wouldn't know.
nobody's questioning your expertise! Just wondering how he could have no difference in weight on this front end with a loaded rv. easy now!
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Old 07-22-2018, 04:34 PM   #18
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nobody's questioning your expertise! Just wondering how he could have no difference in weight on this front end with a loaded rv. easy now!
My comment about expertise was not directed at you - someone else did the questioning.
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Old 07-26-2018, 09:26 PM   #19
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I use the tire manufacturer's inflation chart for the specific tire I am using. Based on my scaled weights, I run 65 psi in all 6 tires, whether I am towing or not. I could probably reduce the pressure when I am not towing, but it is too much of a hassle to reinflate to tow.
My weights are as follows: truck only, front - 4,960 lbs, rear - 3,800 lbs for a total of 8,760 lbs. with my toy hauler but little to no cargo, hitched the weights are front - 4960 lbs, rear 6,850 lbs for total on the truck of 11,540 lbs with 2,780 lbs on the pin.
I have a B&W Turnover Ball hitch and 5th Wheel Companion. I believe that B&W's recommendation is to mount the turnover ball receptacle directly over the axle. The 5th Wheel Companion does allow for some forward and backward adjustment, maybe two inches. In any case based on no change in the front axle weight, my pin must be directly over the rear axle.
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