I have a 2000 Cherokee with 32's, 5 inches of lift with the sub frame tied and all the stuff needed to keep it aligned right. When I tow my 5 x 12 sure-trac trailer I get a front end vibration. I tried moving the ztr to the back thinking I had to much tongue weight but the trailer bucks instead. Tire inflation is fine, and lugs are tight. When loaded the trailer and equipment weigh about 2500 lbs. Thanks for any input you have.