Spongy floor prognosis

Usually just around the edges but my memory of Lunar floors is now a few years old!

Well John, no one has responded, so here’s my take. It’s not quite what you asked, but in my experience vinyl, when it’s been laid, tends to have been applied right across the floor, to the walls, then cabinets are screwed down on top. In the days before lose carpets they tended to be laid down with just the border under cabinets. In both cases, regardless of whether they are stuck down, you’ll need to very neatly cut around the edge. In the case of vinyl you’ll probably need to glue the edges afterwards to stop them from curling. Cutting around it sounds like a nightmare to me - what about those places like under the overhang at the front of the fridge? Maybe you can cut some bits then roll it back. I sense plenty of problems with that though. With regard to weather leaving a soggy floor alone is OK, all I can say is that when left, the problem seemed to spread, slowly. Rebonding in our case stopped it dead. I’ve had a couple of domestic carpet off cuts bound around the edges by our supplier, which might be worth considering if removing your vinyl or carpet neatly isn’t achievable. We did replace the whole carpet in a van years ago, which was a bit of an upgrade. The original carpet once cut out was used as a template. All recent vans have had loose fit, bound carpets, over vinyl,  from new. We bring them indoors for a thorough vacuum when we get home, which saves me scrunching around in a confined space. Good luck with whatever you decide.

Does anyone have any recommendations for the floor repair kits or adhesives.. There appears to be a wide price range. I don't want to pay the earth for something that is unnecessary but, equally, I don't want to have to do the job again at a later date. I will be repairing the floor from inside the caravan. TIA.

Check "Bondrite Adhesives".their products are good (in my own experience).Prices are not too bad and delivery quite quick.