I've just changed my van. It was an Abbey Spectrum with GRP sidewalls. They are really good with regards to withstanding 'knocks', but as stated by Abbey, they are very expensive to replace if in an accident. A friend of mine had the same van and damaged a sidewall requiring replacement.
It was touch and go as to whether it was going to be written off (1yr old!). The reason for this is that it is very difficult to seperate the sidewalls from the GRP front and rear panels. Very often they get damaged and have to be replaced also.
This bumps the price up dramatically. In my friends case, the insurance company agreed to let the dealer attempt to remove the sidewall and report back. If the front and rear panel were undamaged it wouldn't be a write off.
The dealer managed to carefully remove it without any further damge. BUT they did say that wasn't always the case. Often it goes the other way.
I suspect its the insurance companies who have put pressure on the manufacturers, resulting in the return to alluminium.
But I could just be cynical.
Mind you I do own a Garage and deal with insurance companies regularly and see what pressure they can apply.
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