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04-01-2019, 12:10 PM
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#1
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Junior Member
Join Date: Mar 2019
Posts: 14
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Question about load ratings and tire pressure for a towing newbie
I recently purchased a Flagstaff Microlite 21 DS.
My tow vehicle is a 2018 Ford F-150 Screw with 275/65 R18 Load Range C tires. Max PSI 50.
No trouble pulling the TT. I did notice the back tires wanted to kind of squirrel around a bit. Nothing crazy, but I can feel it.
Questions -
1. Are my C rated tires enough? And if so, should I increase my air pressure to 45-50 range up from my day to day of 40psi?
Thanks in advance.
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04-01-2019, 12:11 PM
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#2
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Junior Member
Join Date: Mar 2019
Posts: 14
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Also - TV is a 3.5L Ecoboost with Max Tow Package.
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04-01-2019, 12:23 PM
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#3
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Junior Member
Join Date: Mar 2019
Posts: 14
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Sorry. Can’t figure out how to edit on the app...
I’m using a blue ox pro 750 sway kit as well.
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04-01-2019, 12:42 PM
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#4
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Senior Member
Join Date: May 2017
Posts: 5,712
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Going up to D or E load range will solve the issue for you. D or E have much stiffer sidewalls and won't flex as much as the C range.
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04-01-2019, 12:50 PM
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#5
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Junior Member
Join Date: Mar 2019
Posts: 14
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Thanks.
Question - in the time between new tires...can I adjust air pressure to help?
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04-01-2019, 01:21 PM
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#6
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Senior Member
Join Date: Jul 2017
Location: Albuquerque, New Mexico
Posts: 942
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Quote:
Originally Posted by HiMyNameIsScottC
Thanks.
Question - in the time between new tires...can I adjust air pressure to help?
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Yes, that is what I do. I have GY Wranger SRAs on my TV.
Some may tell you to upgrade to LT tires, but that decision is up to you. Our TV is DWs DD, and the number of days per year that the TV and TT are on the road together does not justify me to upgrade to LT tires at this time.
Congratulations, I saw your set up in "Post your Towing Pics"
Safe and happy travels.
__________________
2012 GMC Sierra 1500 SLT Z71 6.2l aka "Luci"
2020 Grand Design Imagine XLS 22 MLE aka "Desi"
Past: 2017 Prime Time Tracer Air 206
Days camped 2021: 19
Days camped 2020: 18
Days camped 2019: 17
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04-01-2019, 01:34 PM
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#7
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Senior Member
Join Date: May 2018
Location: Central Maine
Posts: 209
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I am actually in the process of upgrading my tires also. However, my trailer is a bit larger than yours. I would think you can get away with your current tires... I would be cautious of over inflating them.
If you are traveling long distances, above 2-3 hours from home, you may want the added security of E tires. Even with my large camper, if I stayed relatively local I would have no problem staying with stock tires. But we tend to take long trips- 1,500 miles+
It's worth mentioning that I have done these long trips on stock tires... but after a few of them, I am upgrading tires.
It will come down to personal preference and what you fell most comfortable with.
__________________
2018 Cherokee 274DBH
2015 Chevy 2500 4x4 Crew Cab
Recurve R6 WDH w/Sway Control
Days Traveled:2021-51 / 2020-43 / 2019-37 / 2018-30
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04-01-2019, 01:39 PM
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#8
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Denver To Yuma In 90 Days
Join Date: Mar 2018
Location: Yuma, Arizona
Posts: 3,882
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Quote:
Originally Posted by HiMyNameIsScottC
I recently purchased a Flagstaff Microlite 21 DS.
My tow vehicle is a 2018 Ford F-150 Screw with 275/65 R18 Load Range C tires. Max PSI 50.
No trouble pulling the TT. I did notice the back tires wanted to kind of squirrel around a bit. Nothing crazy, but I can feel it.
Questions -
1. Are my C rated tires enough? And if so, should I increase my air pressure to 45-50 range up from my day to day of 40psi?
Thanks in advance.
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Are you asking about your truck tires?
Or trailer tires...
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04-01-2019, 02:07 PM
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#9
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Junior Member
Join Date: Mar 2019
Posts: 14
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Quote:
Originally Posted by JohnD10
Are you asking about your truck tires?
Or trailer tires...
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Truck.
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04-01-2019, 02:10 PM
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#10
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Junior Member
Join Date: Mar 2019
Posts: 14
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Quote:
Originally Posted by CentralMePistol
I am actually in the process of upgrading my tires also. However, my trailer is a bit larger than yours. I would think you can get away with your current tires... I would be cautious of over inflating them.
If you are traveling long distances, above 2-3 hours from home, you may want the added security of E tires. Even with my large camper, if I stayed relatively local I would have no problem staying with stock tires. But we tend to take long trips- 1,500 miles+
It's worth mentioning that I have done these long trips on stock tires... but after a few of them, I am upgrading tires.
It will come down to personal preference and what you fell most comfortable with.
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I would definitely keep it below the Max PSI of 50. I was thinking 45psi and that is 5psi over my daily drive.
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04-01-2019, 02:51 PM
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#11
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Senior Member
Join Date: Sep 2016
Location: ALASKA (World's Biggest Campground)
Posts: 6,631
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Are you running passenger tires (P series) tires on your TV? I have seen that most of the half tons come with P tires these days. If so, I would switch to a LT tire. Stiffer ride, but better handling when loaded/towing.
__________________
'07 K3500 Silverado LT Crew Duramax (LBZ)
2016 Salem 27RKSS
1984 CHEV SCOTTSDALE K20 2GCGK24J0E1XXXXXX (Chevrolet Legends-Class of 2019)
"...exhaust fluid? We don't need no stinkin' exhaust fluid"
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04-01-2019, 03:01 PM
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#12
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Senior Member
Join Date: May 2018
Location: Central Maine
Posts: 209
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Quote:
Originally Posted by HiMyNameIsScottC
I would definitely keep it below the Max PSI of 50. I was thinking 45psi and that is 5psi over my daily drive.
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Be cautious that close to the max... 45psi in the morning before you leave home could go WAY up by noon on the highway in July!
__________________
2018 Cherokee 274DBH
2015 Chevy 2500 4x4 Crew Cab
Recurve R6 WDH w/Sway Control
Days Traveled:2021-51 / 2020-43 / 2019-37 / 2018-30
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04-01-2019, 03:07 PM
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#13
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Member
Join Date: Jul 2016
Location: Parrish Florida
Posts: 46
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I have the same Goodyear's on my 2018 Sierra with max tow package. They are rated at 2400 lbs per tire. This rating is achieved at the tire pressures listed on the load tag on the door post. Putting more air in them will not increase the rating, but it does as others have posted, help to firm up the sidewall. Many run close to the max cold pressure listed on the tire when towing. Mine shows 51 pounds max, which is 16 pounds more than the 35 psi on the door post tag.
It is a no cost option to try to see if it helps. My setup is a good WDH with sway control and it tows well when properly setup and tires aired up.
__________________
2021 Palamino Puma 31FKRK ( Seasonal)
2018 GMC Sierra 1500 5.3 Max Tow
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04-01-2019, 03:15 PM
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#14
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Denver To Yuma In 90 Days
Join Date: Mar 2018
Location: Yuma, Arizona
Posts: 3,882
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Quote:
Originally Posted by CentralMePistol
Be cautious that close to the max... 45psi in the morning before you leave home could go WAY up by noon on the highway in July!
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You do realize that the max tire pressure listed on the side of the tire is when it is cold...
And that the warming up of the tire is part of the equation from the manufacturer...
Which means that when the pressure rises because of the heat from driving...you don't have to let air out to get it back down to the max pressure rating.
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04-01-2019, 03:43 PM
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#15
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Junior Member
Join Date: Mar 2019
Posts: 14
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Quote:
Originally Posted by D W
Are you running passenger tires (P series) tires on your TV? I have seen that most of the half tons come with P tires these days. If so, I would switch to a LT tire. Stiffer ride, but better handling when loaded/towing.
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They are indeed LT275/65 tire. Running them at 39psi daily.
50psi cold rated.
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04-01-2019, 04:05 PM
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#16
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Senior Member
Join Date: Jul 2017
Location: Albuquerque, New Mexico
Posts: 942
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Quote:
Originally Posted by HiMyNameIsScottC
They are indeed LT275/65 tire. Running them at 39psi daily.
50psi cold rated.
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Ok, not to doubt you, the side wall of your tires clearly state LT275/65 R18? Reason I'm asking is because LT tires have a higher max cold PSI, maybe around 75-80 psi. If your tires don't have the LT before the size, they are P rated.
__________________
2012 GMC Sierra 1500 SLT Z71 6.2l aka "Luci"
2020 Grand Design Imagine XLS 22 MLE aka "Desi"
Past: 2017 Prime Time Tracer Air 206
Days camped 2021: 19
Days camped 2020: 18
Days camped 2019: 17
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04-01-2019, 04:15 PM
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#17
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Senior Member
Join Date: Nov 2015
Posts: 672
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Quote:
Originally Posted by JohnD10
You do realize that the max tire pressure listed on the side of the tire is when it is cold...
And that the warming up of the tire is part of the equation from the manufacturer...
Which means that when the pressure rises because of the heat from driving...you don't have to let air out to get it back down to the max pressure rating.
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True, you do not need to worry about the rise in tire pressure during the day.
Fill your tires cold up to the stated PSI and try them out. Do not be afraid to run the up.
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04-01-2019, 04:19 PM
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#18
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Senior Member
Join Date: Jul 2018
Location: Crossville,TN
Posts: 588
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If he could post a picture of his door tag that would be big help.
__________________
Retired 2020.
46 Years RVing and no end in sight.
2018 Ram 3500 SB Limited, CC, 6.7/Aisin, 4X4, SRW. Comfort Ride Energy Absorbing Hitch.
2020 Cedar Creek Hathaway 34IK, Reese 19K Sidewinder PB.
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04-01-2019, 04:40 PM
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#19
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Junior Member
Join Date: Mar 2019
Posts: 14
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Quote:
Originally Posted by Chief T
Ok, not to doubt you, the side wall of your tires clearly state LT275/65 R18? Reason I'm asking is because LT tires have a higher max cold PSI, maybe around 75-80 psi. If your tires don't have the LT before the size, they are P rated.
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Ha. No worries. Attaching pics.
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04-01-2019, 04:44 PM
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#20
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Junior Member
Join Date: Mar 2019
Posts: 14
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See attached.
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