I've used the crossmember successfully. It's an enormously strong point, and it puts much less strain on the structure of the car since you're supporting in the center and under the engine. But you've got to be extremely careful and patient not to get "in" to your oil pan, and to use a pad that is not so thick that the "prongs" on the corners of your lift pedestal can't do their job in keeping the crossmember inside the pedestal. Even better, you could make a wood fixture for your jack to cradle the crossmember, which would be handy and the safest bet. I've never hurt or tweaked anything picking the car up from the frame rails, but it still makes me cringe when I see the weight of the front of the car starting to make things bow. It's unsettling, but never seems to hurt anything. At least you can fit a jack under it SOMEWHERE. My S351 Saleen is too low to use a floor jack, period. Only a drive-on lift or a pit will do.