I have installed a two (2) post lift in my garage. I have a 64 Impala. I am having trouble finding a suitable place for the rear pads of the lift. I have been using the area just behind the intersection of the frame rails but that position leaves the pads very very close to each other. The car rocks too much too suit me when the lift starts up or I release the lift to lower. Do people use the rocker panels in the rear as lift points. Are they stout enough? Thanks