I have been asked by some friends to design and build a deck for them, but it has to have a wheel chain ramp on the side. Can someone please tell me, or provide a link that says what the rise over run is for a ramp. What is the angle that this ramp has to be at. Also, is there are particular considerations for this ramp? I have built decks in the past, but this is a new challenge for me. Tomorrow I am heading to the library to get some books on this, but I am hoping that someone here can tell me. Thanks. BTW, the deck is about 2 feet off the ground and is about 15 feet wide.