Vibration with Falken Wildpeak at4’s?

Size is 275/60/20
Load index is 115

 

Got a picture of the side wall with the size?
Nevermind just saw they are not LT

 

Ok could there be a difference in the LT ride vs Regular?not a tire guy here
Who’s running LT 275/60/20
&
Who’s running 275/60/20
Could there be a difference

 

My Cooper Discoverer AT3 4s 275/60/20 are run at 40 PSI. They were balanced regular, not road force. They are not LT. Mine weigh 46# each, LT's weigh 57# each

 

@Lunar * Rock just get them rechecked if you get a line of bullshit just go somewhere else and pay for it again.

 

285/75/18

I’ve had no vibration…running 35-40 psi around town, 20-25 psi backwoods
But I rarely drive 70 mph

 

I am getting some vibration at 65mph with these tires. Had it for bout a month.. they are mounted on brand new fuel wheels. 275-65R18 +20 offset..
Shop clocked them, road force balanced 3, 1 did not needed.. alignment checked and was in spec. Vibration is intermittent. But when it does, you can really tell the steering wheel shakes..sometime it would vibrate at 60mph. Below that or above 70, it is smooth as butter..

I have them at 35psi all around.. not sure what to do next..