No real need for anything on your floor just cover any potential scrape zones with a rubber mat or similar, Protectakote is a
good job if applied right, before applying clean and lightly sand the van floor to remove the gloss, would also advice adding a hardener or it will take a lot longer to add three coats.
You will still need protection in places where you will dragging anything in and out of the van that has the potential to scape
so would still recommend a rubber mat to keep the floor tidy long term.