Hi! Camen 345......I look forward to help out this problem. It seems you have a problem with tires, mostly it gets trimbling at about 60 to 65 mph. It almost feels like your jeeb has been getting a flat tire. For this purpose roll your hands over the tread of the left front tire, it should feel smooth if it feels bumpy or you can feel your hand hitting each set of treads then it is the tires. This would requires front end alignment. An easy way to verify is to rotate the front tires to the rear.
The other possibility is the steering dampner that is like a shock absorber hooked to the drag link of the steering. However, it most usually only causes an issue after you have hit a bump.