I am replacing the lower control and thrust arms. I know you have to load the front end before tightening the nuts and bolts, question is??? Can I leave the bolt/nuts loose and then drive it up on a pair of ramps and then tighten them or do I have to have the front and back end level? I suppose I could drive the car up on the ramps and then level the car using a jack and stands. Will that work? The other question is do I really have to load the fenders to the correct weight before I tighten or will the weight of the car suffice? Is this really that critical?