I had ply lined floor in my other van I had for 3 years, didn't have a problem with the little bits of water on it as it dried. It's not as if its going to get flooded in there. I had one van coated with the plastic stuff by Omnipole which I found it to get slippery when it rain and my trainers got wet. I've got the new transit which has a plastic on the floor seems to be ok, if it was ply lined on the floor I would just leave it at that. I've also got my reel fixed in the back but have rectus gas fitting hose joints which don't leak. The only water I get in there is from the wet brushes. 👳👳👳