This is a scan from Surirey de Saint-Remy’s Memoires d’Artillerie, Troisieme Edition, Volume II, plate 98, Paris: Chez Rollin Fils, 1745.  It shows a wagon intended for pontoon boats similar to bateaux.  The design is intended to be used with a set of wheels and shafts for horses or oxen that would attach to the left end of the wagon.