Lexan questions

[mattblack]

What would be the best thickness Lexan to use for a rear screen?

Also, there seems to be a lot of different information on bending it. Will it bend into a slight curve cold?

[63Wagon]

When I used to glaze fork truck roofs I would use 4mm and it would curve quite drastically from cold , 6mm isn't as flexible but will still curve over a larger area .
The truck was like this and had a window from mid roof to the front aperture
LINDE H45D Diesel forklift truck Perkins engine full cab 4.5 ton lift £2995+vat | eBay

[Kustom Jim]

Think I used 4mm (acrylic!?) in my rear windows - glued in with silkaflex or summat. Assumed the gentle curve fine and still there 5 years later