Here's my lovely wooden 20U rack trolley, made by canford, in great condition bar a little scratched patch on one side. Apparently there was a back panel at some point but there isn't now! Collection only obviously - east midlands very close to M1/M6 A14

it's essentially this: https://www.canford.co.uk/Products/11-320_CANFORD-WOODEN-RACK-TROLLEY-20U-Ash

here's what they say:

CANFORD 19 INCH WOODEN RACK TROLLEY

20U wood rack, made from solid ash and ash veneered high-density chipboard. Fully punched rack strip in front face, slightly raked. 125 mm ‘kick strip’ skirting front and back, laminate faced. Fitted with four 75mm wheels, and two retractable handles in the side. One piece back panel is removeable, a cable ‘mousehole’ is provided at the base of the panel.

Overall dimensions: Height 1015mm, width 545mm, depth 485mm (top), 590mm (bottom). Usable depth 400mm (top), 520mm (bottom).

This is an aesthetically attractive and well finished unit, intended for studio applications. Other sizes and designs can be made to special order.