They all flocked to see what was in the cart, and when they recognised their townsman they were filled with amazement, and a boy ran off to bring the news to his housekeeper and his niece that their master and uncle had come back all lean and yellow and stretched on a truss of hay on an ox-cart.
The carter yoked his oxen and made Don Quixote comfortable on a truss of hay, and at his usual deliberate pace took the road the curate directed, and at the end of six days they reached Don Quixote’s village, and entered it about the middle of the day, which it so happened was a Sunday, and the people were all in the plaza, through which Don Quixote’s cart passed.
There are no more uses of "truss" in the book.
Show samples from other sources
The same trusses carry the weight of the roof and the ceiling.
Cordelia turns to the back pages of the catalogue, where the pictures are in gray and black and there are crutches and trusses and prosthetic devices.