I have been doing some research and from what I have come across....and remember I am no expert, nor have much in the way of concrete experience....but the addition of fiberglass to the mix does not negate the use of re-bar? The fiberglass helps with the concrete strength and cracking, but you should still have some re-bar in the pad regardless.
Re mesh is all you need, not rebar. A guarantee in life, concrete will crack, the use of metal helps keep the crack from separating . Being just a car port he may not want the trouble we've given him and a simple slab on stone is all he wants