DS:
Many thanks for your in-depth reply and suggestions. I like the IBERA even though it's the pac that's 'clip-less' and am considering it. As you and the others who accurately wrote, the post mounted models fit the bill but don't have a high weight capacity. I guess in the end four screws are not that big a deal if I want/need to remove the rack at times.
Thanks again and sympathies go out for Craig Elstins.
Bruce