- T5 SE 140
We had a GRP roof on our T4 California and it started to show signs of stress after 9 years. It started with the name on the front starting to peel off. The rest seemed ok at that point but I thought it was a message to upgrade and moved to our current T5. It did have 4 big black bolts in the centre of the roof which always struck me as a weak point.Mercedes are replacing roofs on the Marco Polo which are GRP. Some are on their 2nd replacement roof.