How about driving one side up onto the curb; you might be able to slide under on a piece of cardboard. Or if that isn't enough height, place a couple of 2x6 or so on the curb first. You can also buy steel ramps to drive it up onto. I have a lot of wood around, so I made some ramps myself. Be sure it's completely secure before going under there.
When you get under, take plenty of rags; if the source of the leak isn't obvious, wipe everything as clean as you can and then it will be easier to find the leak the next time you look. If it's clear it sure isn't crankcase oil. Have you checked the brake fluid level ? It's kind of clear and smelly... Steve