I've got a ripple!

My new roof-top solar panel kit is on it's way, so today I took the opportunity to get up on the Rimor roof with the cleaning gear, and give the whole roof a deep-clean scrub in advance.
It was a hot afternoon, and as I reached the topic the ladder I was shocked to clearly see a large 'ripple' midway down the roof area, where the panel was going to be positioned.
The van is 2004, with absolutely no damp or ingress problems (that I know of!) and I've never seen any roof ripple before. I had a look this evening, it's obviously cooler and everything seems back to normal.
I'm now concerned about bonding the solar panel just to the roof skin in case it makes the situation worse.
But what if I used the four panel mounting brackets as a repair method? In other words, trace where each corner panel sits, then cut a smaller piece, within the triangle profile, out of the roof skin, exposing the ply beneath. Then apply the adhesive/sealant to each exposed section, so that each corner bracket is glued to the ply and also to the surrounding skin.
This way, the ripple should be restricted by the four glued brackets....at least, that's the theory.
I hope I've explained my plan clearly, all comments, advice, suggestions welcome.

There is no way I would contemplate cutting your roof skin. No Way.

I agree. Don’t just stick them to the outer skin. But do not. Repeat, do not cut the outer skin. There are ways to bolt through, but cutting a chunk out of the roof skin is not the way to proceed.

Ok, ok. I promise I won't cut the outer skin. I'll screw or bolt the corner plates on. I know it makes more sense, and I'd feel more confident about it.
I'll have a read of that link tomorrow, in the meantime anyone know the usual thickness of a camper roof? Enough depth for screws?

Thanks. I'll drill the cable hole first, and hopefully use that as a way to measure the roof thickness. Between cleaning and sat dish maintenance, I've been up there many times over the years and never felt any flexing or movement, so I'm guessing it's a fairly substantial construction.

Let's rewind here a moment. The panel hasn't arrived yet and I'm already confused!
My original plan was to mount the panel (130 watt) on the roof using the four supplied corner brackets, plus additional aluminum right angle strips along each side, and finally an angled 'windbreak' strip along the front edge. All glued down with the correct adhesive. Proper job, no worries.
Until yesterday, when I first saw the ripple. Now, for all I know, that ripple might have been there for a while.... I can't recall ever being on the roof on a really hot day. (there's an old Kenny Lynch song there somewhere).
Perhaps the outer skin was always floating, who knows.
As the ripple area is exactly where I planned to put the panel, I'm thinking that the weight of it when glued to the skin would keep the ripple 'under control'. I really can't imagine the panel violently lifting up and down while travelling enough to split the roof skin.
Having said all that (and thanks for staying awake) I obviously stand to be corrected as to the best option: 1) glue only. 2) glue and screws.

It’s hard to say without seeing your roof. The most common way is to stick them down. However if you have a roof type that has a hail barrier, which appears, according to yourself, to be “floating” on top of your solid roof, then you would only be sticking the panel to this top layer. If you are confident that it is secure enough, to stick to this, then that’s the way to go. Penetration with screws is a second last resort...... but ahead of cutting a lump out of it .

Tony, as Daffy said you might have a hail roof I think I have one as I can see mine move in high winds. I bought my van new and it came with a TV aerial so I assume it was factory fitted. It had a roof replaced at the factory after 4 years with the aerial put back on so I dont think it would just be glued down and assume it is screwed down