I just oredered a "Swingaway cargo holder" by Stowaway2. (see www.stowaway2.com for details). Basically, it is a cargo holder than connects to the tow hitch receiver.
However, the company told me there is a problem having it fit in the tow hitch receiver--becuase the OEM hitch receiver does not meet standard dimmensions.
More specifically, there should be atleast 3.5 inches between the spare tire and the safety pin hole located on the "stinger" (this is what is actually inserted into the tow hitch receiver)
On the 2004 LX 470, there is no more than 1.25 inches.
The company told me they can make it fit onto the Lexus by cutting the end of the stinger, to accomodate it to fit, without the spare tire getting in the way.
This is a known issue (hitch receiver not up to standard specs) with many Lexus and Toyotas, according to this company.
I called up a UHAUL place that attatches receivers...they said the same thing.
Any thought.