We've just bought our first static caravan and I'm loving it! Although we haven't actually slept in it yet, I had a shower yesterday and found that the cubicle seems to be detached -ie the walls are wobbly. Can this be fixed? (I have no idea about these things, please forgive my ignorance)
It does not sound right to me. The walls will probably be flexible, but not actually wobbly.
If this is a newly made static, then it should still be under warranty, so ask the park owner (or the manufacturer if the site owner is unhelpful) to inspect and rectify.
If it is a resale home from the park, then there should be some degree of "fit for purpose" so again as the park owner to inspect and rectify.
If it was purchased privately, unless the original warranty was still in force (unlikely) then you can still ask the park owner and/or manufacturer for advice, but will probably have to get it sorted yourself - any local bathroom installer or plumber can probably do the work.
EDITED:
Forgot to mention, check what your contract says about using outside contractors - a few holiday parks restrict outside contractors, although as this is inside your static you should be OK.