Welcome to the forums and congrats on your new Berkshire. As far as the knocking noise under the steps, look at the black wheel well liner. It is probably missing a screw that keeps it from flapping and banging when travelling. Also, the lighted handle should come on when you turn the aisle lights on. There is a bank of switches in the front bottom of the dash near the step well. One switch will turn on the aisle lights and the lighted handle.
Again, welcome and hope you have many safe, fun, memorable and trouble free trips with your coach.
Tom and Margaret
2014 Berkshire 390bh-60