We made our new camper into a travel bug. The decals are very small so to make it possible for people to see the number on the back of our trailer while we travel, we got it blown up so its almost two feet tall. I guess its kind of cheating but while on the highway it will be visible from behind and when camping you will only to be able to see the small one on the front. We put on 3000km since we put the decals on, and still no one has discovered it! We were at Rainbow Falls the august long weekend and I know there were other cachers in the park, but I guess they didnt walk by our site or they didnt notice the decal.