Cab is detaching from the camper body

[SprinterLmc]

Hello, I recently bought Lmc mercedes sprinter based motorhome, make 2002.
It had a squeak from the beginning but I thought that's normal, but after I discovered that the cab is moving a little different than the body (about 1cm play)
After closer inspection I saw that the cab is detaching from camper body. I see on forum that those two are held by couple screws on each side, behind the seats. As it seems that I would have to disassemble half of the van to expose those screws I'm wandering would it be ok to drill the holes from the cab to the roof, throuhg the bedbase, and secure the seem that way. Also put expansion foam to seal that and caulk afterwards.
As I'm new to this and these are just my theory thoughts, I would like to hear from more experienced people how would they solve the problem.
Thanks

 

[gpat]

That sounds like significant knowledge is needed to assess.

 

[Jimbohorlicks]

Can you put a photo up.

 

[Googlebot]

If you are using anything, make it a fill, glue and seal from the likes of Sikaflex. Expanding foam will deteriorate quickly, soak up the water and be useless.

Photos as others have said will help.