I've completed a few mixed wagons for the English defended encampment at Verneuil.
I suspect that it was common practice to defend encampments before battle this way, as shown in the contemporary drawing from slightly later in the fifteenth century and therefore probably not noteworthy by chroniclers and writers. It was critical however at Verneuil, as the Armagnac Lombardy mounted men at arms broke through the English line and headed for the camp, presumably for some plunder assuming that the battle would be won. They were then forced back from a contingent of English archers either left in reserve of within the camp - a turning point of the battle. The use of wagons as important English defences is also noted at Rouvray (also termed 'the Herrings') in 1429.
The wagons are from Front Rank, Kingmaker (the Hussite modesl without the extra defensive sides) and an independent manufacturer I purchased on the web. They've been dipped and matt varnished for speed and I managed to do them in a week, which is pretty fast for me. The defensive inserts are just pavises, stakes and odds I had to hand.
I have one more to complete, to try and cover three sides of the camp; I'll photo them again soon, when I also finish off some English archers to add to the wagons.