I would like to use a bike rack on my old Jeep Cherokee. The rear hatch is fabricated from fiberglass composite (?) or something else that is not metal. I bought a bike rack - the kind that uses straps and clips. The directions with the rack said to use it only on metal trunks and hatches.

Has anyone else encountered this problem? Are there racks that are appropriate for installation on non metallic hatches or trunks?