you just cant trust dealerships anymore, they just tell u they found something just to keep u happy. I am a mechanic myself and they treat me like im a fu&^n idiot. have checked my spare tyre and it is firmly secured. in regards to checking the unis, you need to hold either side of the joint and rotate them in opposite directions back and forth and feel for movement. if you have a 4 post hoist, that would be best because the uni will be at its normal operating angle. if you use a 2 post hoist the uni angle will increase due the suspension drop