You may have to make an adjustment in some of the T-type lock downs, One may be too tight to allow you to lock the picture frame adapter into place.. I had one before I purchased the B&W RVK 3600 and had to loosen up two of the T locks to be able to lock the adapter into place. Should be info on this in the installation of the adapter. If your's is like my Mopar picture frame adapter, There are cotter pins holding bolt in place inside of tub, not very easy to remove..again, this is with the Mopar picture frame adapter that I had to use to drop into the puck system, then mounted a hitch to the adapter.
