I purchased a '15 KR cc sb some time back love the truck! It came with a leveling kit and tires were changed to Michelin 35's on stock rims.

The issue is that on certain sections of concrete interstate the truck "bucks" back and forth...a lot.

Any suggestions?

 

Bucking in the front or rear? Cheapest solution could be to drop your air pressure to 55ish. New high quality shocks help a lot of people.

 

Thanks. Just lowered everything to 55...we will see how that effects the issue.

 

Yes, change lanes....Mine does this on a section of the Thruway which the big trucks have beat the slabs into submission. Much more pronounced with a trailer attached. Only fix I've found is to change lanes and bitch to the authorities to repair the road. I run 70 psi when towing then back it down to 55-60. At 55psi its better but not gone. Its the chassis architecture. Its what a straight axle truck does. The split shaft front ended trucks don't suffer this fate.
Im upgrading to Rancho 9000s soon we'll see what that does.

 

In MI the longer the truck the worse it rides thanks to the crappy roads. My crew cab with 8' box is unbearable where my wife's SUV is smooth. Lowering tire psi helps but doesn't fix the issues with expansion joints and frost heaves.