Improvments in sidewall constructions.

When I first started reading on this forum 10 years ago delamination seemed to be a big problem with the MH's manufactured before 2000. I don't see many posts about newer MH's and delaminations. I have not seen any data on new materials being used other than some thermoplastic materials like Azdel for Lance campers, or new bonding processes other than pinch rolling or vacuum bonding. When I visit MFG web sites I see marketing terms rather than engineering descriptions of materials and processes used. Does any one know what improvements have been made if any to the side walls of the newer MH's in materials and processes? I also learned that Newmar and some Monaco's uses the hung wall process that can not delaminate (no laminates to begin with), are there others Mfg's that use this process?