Nick,
I'd leave it as it is - but to explain why I need to tell you about Eriba caravan floors...
Eriba are known to be long lasting caravans - and are a good test bed for exposing problems that crop up after many years of ownership.
In the 1970's and 80's, the Hymer / Eriba factory coated the wooden underfloor with a bitumastic type product - completely sealing the floor from the elements.
And now those floors are proving to have a few issues - if the coating is damaged and damp gets into the floor, it never gets out again and then you have the possibility for problems to start.
Earlier Eriba plain wooden floors "breath" and naturally dry as the weather changes - and are still in great condition. Newer Eriba floors are coated with a breathable coating, protecting the flooring from splashes and the odd river crossing (there's a photo on here showing an Eriba + LR wading a river in a tiger reserve in India) but still letting it breathe
So - I'd leave it alone...
Robert