I need to get under my Challenger to install a skip shift on my FF 6 speed and need to know what brand of metal ramps will let me drive up and clear the front spoiler. Has anyone used ramps that will clear the front spoiler AND also let me back up on the same ramps and not scrape the front spoiler. I want to do a blastinbob install as well as install a CURT trailer hitch I bought. I'd appreciate anyone who has first hand knowledge of the correct ramps to buy. I have a floor jack but I don't really want to buy jack stands and balance the car on them while I work under the car. Looking for some not too expensive ramps.