If you do concrete, skip the wire mesh and spend that money on extra thickness: 5". Then be sure to tool or cut joints so that no individual slab is more than 15'x15'.
And make sure there is NO topsoil under the 4" crushed gravel base and that it's firm. If it's mushy, cut more until you get to firm ground and add more gravel base (called "undercut" in the biz).
Wire mesh is too small to do any good if the base is soft and there is no usefulness to it if the base is good. So it's overall worthless (besides, most concrete guys end up stepping on it during the pour and it's not even located in the middle of the concrete where it could actually do a miniscule amount of good.
BTW, I charge clients $190/hr for the above sort of advice. Take it or leave it, no charge! RVer secret handshake ;)