Tires: changed tires from P275/16R18 tires to Michelin LTMS2 LT275/16R18, trailer tow package, ford f 150

Question
I would like to know at what pressure I should run my tires at. I have a 2010 F150 XLT 4x4 Supercab w/XTR option.
My truck has the max payload package as well as the max trailer tow package.
I switched to the LT tires as I have too much trailer sway, even with a dual cam trailer sway setup.
The travel trailer is a 2007 Jayco Jayfeather 29 9N.

thank you in advance.

Answer
Leonard,

According to Tire Guides, a 2010 Ford F-150 XLT 4X4 SuperCadb with P215/65R18's ought to have a placard pressure of 35 psi, but there was an option for an LT275/65R18 where the pressure was specified as 45 psi front/ 60 psi rear.  I don't think this second presure is correct.

In order to get the same load carrying capacity that a P275/65R18 does at 35 psi, an LT275/65R18 needs to use 47 psi.