[JRTJH]

The OEM speakers have relatively small magnets and weigh about 6-8 ounces each. Larger "high quality" speakers may have significantly heavier magents and may weigh as much as 3 or 4 pounds each. Depending on the speakers you want to install, you may find that when the trailer is "bouncing down the road" you'll find them hanging by the wires or laying under the table if the 4 "small wood screws" pull out of the 1/8" luan ceiling panel.

If the speakers are more than "just a tad heavier" you might want to glue some 1x2 furring strips above the ceiling panel and screw the speakers into the furring strips (through the luan panel). That would give a much better bite and probably prevent the screws from pulling through the thin luan panel.