Welcome to the Bunnings Workshop community @DeniseK. It's great to have you join us, and many thanks for your question about sourcing paper veneer.
You might like to discuss what options are available from your local supplier with the team at the Special Orders desk at your nearest Bunnings. We might be able to order you a 3mm plywood in a light colour. However, paperbacked veneers are a relatively specialised product. We also have these MDF-backed Colourboards that you could use. The 2400mm x 1200mm x 3mm Melamine MDF Drift Wood would be a lighter variant. Let me mention some of our caravan and woodworking enthusiasts. @Peggers, @FloTheCaravan, @twocutekelpies and @r23on to see if they have some suggestions.
You might also like to check out these 10 caravan renovations and @Peggers' complete three-part guide on How to renovate a caravan - Part 1.Please let me know if you have any questions.
Mitchell
Try this place they may be able to point you into the wright area
52-58 Fillo Dr,SomertonVIC 3062
T +61 03 9357 3345