Cheap rubber load area floor

[Jonathan Tompkins]

I saw a bike mechanics workshop floor decked out in conveyor belt rubber and thought it might be a cheap way to get a rubber floor for my lwb t6.

Then I found this
http://rubbermattinguk.co.uk/en/essential_grid/van-load-bed-rubber-matting

and this
Products – Rubber Matting | Cheap Rubber Matting & Flooring for Stables & Horses

Although I was originally thinking of stuff like this Products – Rubber Matting | Cheap Rubber Matting & Flooring for Stables & Horses

Or this

Fine Ribbed Rubber Matting | Width: 180-200cm Thickness: 3mm

£60 to cover a lwb. Is 3mm thick enough?