Does anyone know a source for the grey Astro turf material. The cradle on my standard Winder trolley is leaving residue and scuffs on 3734's bottom.

Try Welsh harp, they supplied my new trailer which has it on.

Lots of places do green - even the supermarkets or diy sheds do doormats that can be cut and pieced. We got a roll of it from a motorhome show!