the thing I was most interested in was the ground psi of the chariots of that day...
also, an important idea in this post! if the bible doesn't say the israelites had carts at the red sea... yet we can guess that they did based on
if they carried lots of weight
if they had carts by numbers 7
if the carts themselves were part of the spoils
so, with things that the bible doesn't state, we can still make good guesses about... and I think that's part of biblical interpretation...
Since they had wagons when they came to Sinai and they reached Sinai only two months after leaving Egypt I think it is more than reasonable to assume they had the wagons when they left Egypt. They had to have some way to transport the massive amounts of spoils.