While browsing images in the British Museum, I came across this print. I don’t know how permanent it will be, but here is a link.
The caption reads “A party of people in a boat on wheels being pulled to right”. Museum number 1868,0328.173. Drawn by James Gillray, British, 1772-1794.
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.