Call the local experts [dot] and ask them where you need it so they don't fine you, get a name and contact number in case someone in the little blue cars doesn't feel the same way the one on the phone did. I'd put it below the ramps like whats already been stated, some ramps have a sloped angle to them when folded up and I have put them on the cross members so they are visible somewhat from the back, half of it is an attempt to do the right thing, if anyone complains then have them dictate where it should go, that way its official as to where they want it.