I don't trust ramps or concrete blocks much. I'm a firm believer in hydraulic jacks backed up with commercial grade jack stands. I've had a Torin 20 ton, long shaft hydraulic jack for many years and they are hard to beat cost and quality wise. I know it's overkill, but it's better to have too much jack than too little. This is a newer model, but similar to the old one in design and price. You can use it manually or with your air compressor.
http://www.northerntool.com/webapp/w...55?cm_vc=C5503