So Im planning on changing my oil for the first time tomorrow...I bought some Rhino Ramps rated at 12,000 LBS....are these safe just to drive the Accord up on alone??? A dude at walmart saw me buy them and he said the crack and they arent safe...what do you guys think? Am I safe to use only these to change oil? any risk of them breaking and the car falling on me? lol. THANKS! btw thats all I have, that and chalks.