I had a van fail once because Id replaced part of the back chassie with a bit of plastic guttering... i argues it wasn;t structural because of the talift above it but the guy wouldent listen....
so i painted it green to match the rest of the van (with the nice green lead paint i used to paint the van
) .... went somewhere else and it passed !
was a good van that one.... tho the van would twist so you couldent close the back doors whit a full (over) load on