[BradO]

Thank you.

It's actually 3-4 inches out from under the spare, so 10in would be flush. That's probably the minimum I would say is ok. You just need to be sure the sensors are far enough out not to pick up the tire or tire cover. If you can find a 12in extension, that would probably be the safest bet and it's a buffer. I've used the ash300 on the H2 since August 2006 and on the H3 since Jan 2007. Also a nice bonus is that it comes with at least one locking pin. I really have to give it high marks for price, ease of installation/removal, and detection accuracy.