Hello all. I am from Trinidad (where X-Trails abound). We get most (if not all) our X-Trails from Japan. I am to be receiving a new one in the next day or two. However, it's not coming with the tonneau cover for the rear compartment. A new cover from the (st)ealership costs like US$600+ !!

I am trying to figure out if any of you guys know of some substitute mechanism I can adapt to fit? Like a retractable window blind or something. I don't feel secure with the back exposed for any thieves to see what I have in there. It's a frequent problem where SUV owners have their rear windows broken and valuables lost, because they are visible from the outside.
Also, what are the typical wheel offsets for 18" and 19" wheels? I am planning to upgrade my wheels after the factory set of tyres (16" Bridgestone) are done. Thanks guys.