I am new to this damp game and I am sure the other 'experts' will have more advice to give. I have just stripped of a section of wallboard on my 6 year old van. I thought that it 'wouldn't be too bad' as the wallpaper was still intact and it was 'just a little spongy in one or two places' and a . How wrong I was.
I found that the wooden rails where the water had got in were completely rotten and peeled away layer by layer (plywood), or flaked away, until I found solid wood again. The problem you have is that the environment behind the 'wallpaper' is perfect for encouraging damp to fester once water has gotten in. If you are resonably competent with tools, then it isn't difficult too replace damaged panels, and there is a heap of help and advice available here.
I guess you have to figure whether or not the effort is worth it to you against the price of your van and if you are thinking of reselling at some point. Personally, when I found my damp, I removed every trace of it that I could and replaced/repaired anything that was damaged. You might find like me that the wooden rails where the awning rail attaches, or the window surrounds are rotting. I didn't want my awning rail pulling away as it had nothing to attach to any more.
Until you remove what is covering the damp, you won't know for certain. I guess you could gamble that 'it was OK last year' so the damage below the wallboard should be minimal and drying it out is enough'. It is a tough choice.
You will most likely need to source the wallboard already covered, which you can get from many sources (see the other listings). I personally haven't found anywhere that supplies just the wall covering for caravans. It is like a toughened vinyl paper which you can't buy in ordinary stores, but someone must make it. If I find it, I will let people know.
Hope my thoughts on your problem help. Regards, Kevin.
------------- Always keep the shiny side up...
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