The two styles shown are standard skateboard shapes that have been around for decades (surfboard-shaped and "fishtail"). There's lots of varieties of both these shapes in production everywhere. The routed-out wells shown above the wheels on the underside of the boards are standard for many skateboards, too (for "wheel-bite", to give the wheels more room when the board flexes side to side). The long vertical routed lines may be novel, but aren't in question (please read on).
An attorney for the company associated with these two skateboard design patents seems to be sending cease and desist letters to anyone trying to sell wheels attached to an oblong wooden board. He's essentially going after any small, vulnerable manufacturer making skateboards shaped like skateboards, regardless of any embellishment. The skateboard makers accused of infringing do not carve vertical lines or wells under their boards; they do, however, shape their boards like skateboards. That's the only similarity to these drawings...the shape of the boards, which the patent holder did not, of course, create. What specific aspects of this design patent could this attorney be calling infringed?
This attorney seems to be claiming for his client a design patent for a novel decoration on a common item, and is claiming the exclusive rights to make this common item (with or without the decoration). How does the patent office (or who will) handle patent misapplication/abuse?
Google links to the patents as well...sometimes these are quicker to read: