Gore, Hawk, Trailet, Equispirit, Brenderup, Cotner, Circle J, Royal T, are the first eight that come to mind. Cimarron and Hart have a honey comb fiberglass roof of sorts and I would imagine you could get a wood floor on some models.

Here's one I'm not sure about.... It say fiberglass roof, bit I've never heard of this brand. Not sure about the floor.  http://www.wagonwheeltrailers.com/horsetrailers/windrider.htm

you wold have to add Bison and Kiefer to that mix. Kiefer still builds a fiberglass roof and wood floor trailer.