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Old 05-04-2015, 04:31 AM   #1
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Towing a Trailer Using SL Load Range Tires

Recently got a new tow vehicle and it came with 265/65/R18 tires.
Have always used 10 ply (E Range) tires in the past on Ford Super Duty trucks, but this is the F150 model and concerned about towing with this tire.
Unit is a 2001 30" Excella. Running PSI on door post states 35 PSI and Goodyear Wrangle chart shows max PSI to be 51. In the past, always ran "E" tires at 65-70 psi with no problem.
Not sure where to inflate new tires to carry load and be safe.
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Old 05-04-2015, 04:59 AM   #2
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35/35. If you deviate from that very much, it will probably turn on the TPMS light, and alerts for "check tire pressure".
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Old 05-04-2015, 05:45 AM   #3
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I wouldn't be too concerned. I'm sure Ford has equipped your F150 with tires that have enough load capacity at 35 PSI to handle the axle weight ratings.
The minimum air pressure required from the load/inflation table should be used. You'll need to take a trip to the scales with your truck and trailer fully loaded and use those weights for any pressure adjustments to your F150's tires.
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Old 05-04-2015, 05:50 AM   #4
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Old 05-04-2015, 11:00 AM   #5
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I have been towing with p-rated (passenger car) tires for 6 years. I cannot get Load Range E LT 8 or 10 ply truck tires in my particular size. I thought about going a size larger (if that is even possible) to get LT tires, but I hadn't thought about the possibility of the bigger tires interfering with the TPMS-
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Old 05-04-2015, 11:02 AM   #6
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You shouldn't use E rated tires on a F-150 for a couple of reasons. First, the wheels are very likely not rated for E rated tire pressures. Second, if you did mount them you would have to run them at their lowest possible pressure and that would result in really poor wear, increased rolling resistance and reduced mpg. If you run the E rated tires at their recommended tire pressure the ride of the truck will suffer greatly and then also result in poor tire wear (middle treads will wear faster than outer). You probably can go to a D rated tire, but do check the wheels capacity prior to doing so (specs are stamped on the inside of the rims).
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Old 05-04-2015, 11:24 AM   #7
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Me, I would run the rear ones at 50 psi when towing if that is listed as max inflation or load on the tire. I would not go over or under the max load inflation listed on the tire. I can not see any advantage to running them lower with a full load. I do not know what SL load range is, but 51 psi max would make it in about the old C range. You can get D tires in that size I expect.
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Old 05-04-2015, 12:03 PM   #8
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If those are the Goodyear Wrangler SR-A tire, 44PSI seems to be good when towing.

I upsized my tire to get a load range E tire because I wanted stiffer sidewalls for a number or reasons.
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Old 05-04-2015, 12:44 PM   #9
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Check the load rating of your tires, probably it is a 107 or 108. If you find your combo feels "loose", you can get 114 load range tires, Cooper,or Yokahama are two that come to mind. They help our Jeep GC tow much better. Used to run the TV tires at 50 psi and felt the Jeep oversteered on corners. On the way back from Ca. in April, lowered the pressures 2 psi at a time. Also lowered the front by 2-4 psi more than the rear. Doing this the trailer didn't "push" the rear around when cornering. Ended with 40 psi front and 44 rear, oversteer pretty much gone and our combo feels stable at speeds to 70 mph. Make small changes in pressure with a couple of days towing between changes to feel the effects.

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Old 05-04-2015, 12:56 PM   #10
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Wow. I run the 33 psi on the door placard with no ill effects.


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Old 05-04-2015, 03:46 PM   #11
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I have used passenger tires pulling a 30 Classic for 30,000 miles over 5 years and had no problem. I run 40 lbs. when towing. If you look at the load range you will find you are well within their capacity. One benefit is a better ride and easier on your trailer.
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Old 05-05-2015, 03:38 AM   #12
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So long as you are towing within the limitations published by the vehicle manufacturer, the tires they supplied should be OK for towing.
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Old 05-05-2015, 03:58 AM   #13
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Both - new to me and new. Always used the Super Duty version in the past, but wanted something more like a car than a heavy truck, so tires, etc., are a thing I never thought about with the SD. Lowering a trailer with a 970 lb. tongue wt. on SD did not even move the rear end, so weigh transfer with bars was minimal. Do not think that will be the case on the F150
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Old 05-06-2015, 04:56 PM   #14
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Strongly suggest you confirm with actual scale measurements TV F & R axle loads plus the total on the TT.
You have information on GAWR F & R as well as GCWR (ttoal of TV & TT)

You should never exceed any of the vehicle weight ratings or any tire ratings.

There are Load & Inflation tables available for your 265/65/R18 and you should set the inflation high enough to carry the actual load. (Assuming your F150 has the capacity.

Would be interested in seeing actual numbers.

Note the scale reading should be done with both TV & TT loaded to the heaviest you expect to ever tow. People, food, water, fuel, clothes, tools etc That means all the bowling balls in your collection if you travel with them too.
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