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The problem is not enough air. I have the exact same tire and sent Michelin an email on tire pressure. They told me 55 PSI in the rear and 50 PSI in the front to give the same load rating as the P tires the truck came with. You are severly under inflating the tires.

When I tow i don't have any instability issues and if the trailer is setup the same as before then all you need to do is air up per what Michelin sent me quoted here.

In regards to the email you sent stating:
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RECOMMENDATION-PRESSURE
I just purchased LT275/65R18 LTX MS2 tires for my 2009 Toyota Tundra 4x4 Crew Max. They replace the OE P275/65R18 tires. All the dealers that I talked to stated I should upgrade to the LT tires as I tow a 7500lb trailer. What pressure should I be running these tires at? I have been getting all kinds of different answers ranging from what's on the drivers placard to 40PSI not towing and 60PSI towing. I have looked for load tables for this tire size and can't find any. Please help clear this up.

Thanks,

2009 Toyota Tundra 4x4 CrewMax

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When installing a different size than the original equipment tire, all vehicle manufacturer specifications must be maintained. The replacement tire should be inflated to provide the same load capability of the original tire size at the manufacturer’s recommended pressure. In order to identify the correct air pressure for the new tire size on your vehicle, we would need to air pressure as recommended by your vehicle manufacturer. This information can be found on your vehicle placard normally located on the driver's door jam.



Our records show that Toyota's recommended inflation for the original tire size P275/65R18 114T is 30PSI front and 33PSI in the rear.



If this is correct, you can use 50 PSI front and 55 PSI in the rear to meet or exceed the load carrying of the P metric tire size.

We appreciate your business and thank you for choosing Michelin.

It is our goal to ensure that your issue has been resolved or your question answered to your satisfaction. If we can assist you further, please respond to this email or call us at 1-888-871-4444 (toll free) between 8:00AM and 8:00PM Eastern Time Monday through Friday or between 8:30AM and 4:30PM Eastern Time on Saturday.

Sincerely,

Colesta
Consumer Care Department
Certified Michelin Product Expert
 

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Does the above mean that 50 front and 55 rear is what I need to inflate LT E rated tires to = 30 front and 33 rear when using P rated tires.

What is everyone else who is running the Michelin LTX M/S2's E rated using for inflation. Also what about when towing?
I am running 55 front and 55 rear. When I tow I go to 60 in the rear and leave the front. So far wear is good after about a year of driving
 

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So how does the ride compare with E rated at 55 compared to using P rated? Also did your gas mileage suffer much? Thanks.
I don't really notice a lot of difference in ride quality. Maybe a bit rougher but really didn't notice it. The winter tires are P rated and when I change them out can't say I see much difference either. I think the Michelin's are a very nice riding tire. Not sure how other E rated are but have heard some people say others make for a rough ride.

Gas mileage maybe a touch worse but the E rated tire is a "green" michelin but I don't think the P rated is. Might be wrong on that one though.

I would have stayed with the P rated but wanted the extra stability of the E rated for towing the trailer.
 
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