The documented and recognised advantages for the material are:  

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Greater relative structural strength allows for a much lighter shell.  This reduces weight and lowers the center of gravity.

Corrosion is not an issue so say goodbye to rust or decay.

Huge tolerance of wide temperature variations with no impact on the joints or shape.

Non-conductor of electricity meaning greater safety in a workshop or on road situations.  

Moulded construction can be done in one piece, regardless of shape, which allows more design options, greater consistency and enhanced strength.  

Smooth surface is easy to clean and maintain.

Dents and the like from minor impacts aren’t a factor.  If any repairs are needed they’re easy to do.

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In short, fibreglass is a technologically and aesthetically superior option when compared to metal that:

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is very easy to tow, with better acceleration and maneuverability.  

has less wind resistance, reducing wear on the towing vehicle, drastically reducing fuel costs and reducing the effects of cross and headwinds.  

is easy to clean and maintain and never rusts or degrades.

is rugged and durable.

is well insulated.

can easily have graphics and special designs applied.