To their very great relief, Hagrid had given up on direct contact with the skrewts now, and they were merely sheltering behind his cabin today, sitting at a trestle table and preparing a fresh selection of food with which to tempt the skrewts.
There are no more uses of "trestle" in the book.
Show samples from other sources
Mother was so nervous, she bathed— into the trestle table while curtsying.
Gail Carson Levine -- Ella Enchanted
On the way back home, they were on board when the P & W had its famous crash, when the motorman was drunk and took the high trestle over the Schuylkill River at sixty miles an hour, and the whole kaboodle took a swan dive into the water.