Generally speaking, delamination should be a deal breaker. The problem is that delamination is caused water intrusion. Water tends to grow things, which means you would likely have a mildew problem that would be impossible to get rid of. Second issue is that were there is water, there is also rust. Over time, the vertical stringers rust and eventually become detached from the floor. I have seen many photos of walls where the whole bottom half the wall was completely missing the vertical framing.
There was a motorhome for sale near my house. I took a look at it. They were asking a pretty penny for it. The whole was sagging outward toward the bottom. You could tell there was nothing left holding it together. I don't think the seller had any idea.
'83 Revcon Prince 31' FWD FMCA F298817
502 w/Howell/GM ECM/Edelbrock MPFI,Thorley's & Magnaflows, 4L85E 4 spd, KoniFSD