oddly-shaped craft suspended between sides of the saddle-back mountain, Picacho Peak, AZ

While driving from Tombstone, AZ , home to San Bernardino, CA, on I-10, my father (driving), mother (passenger front side), 9 year old nephew (rear driver side) and I (rear passenger side), we passed a geographical feature named Picacho Peak, 40 miles NW of Tucson, 60 miles SE of Phoenix. From the Interstate, this feature appears to be an extreme saddle-back mountain.
 Suspended between the sides of the saddle-back, approximately ¾ of the way down, was a very odd craft.  It appeared to have a main body with two pontoon-like appendages, running the length of the body, below and to each side.  It was dark orange on the top and dull silver on the bottom, similar to a two-toned car.  It was symmetrical in overall shape, but had all sorts of extraneous box- and cylander-shapes attached to it.  Picture the spacecraft in any recent science fiction movie and you can imagine the overall look.  I cannot estimate it’s size, but the sides of it appeared to just clear the sides of the mountain.
 I alerted my nephew, saying, “Look over there.  It’s a ufo.”  He looked and acknowledged, then looked away.  I had my 35mm camera on the seat beside me, but could not make myself pick it up to take a picture.  This is something I will always regret, not only because it would provide some kind of proof, but because the object is so hard to describe.  This is the reason I have put off reporting the sighting.
 Some years later I heard my nephew telling someone that he and I had seen a UFO.  When I ask him now, he says he does not recall the incident.
Witness indicates that the date of the incident is approximate.  PD