Difference between Forester and Sunseeker are cosmetic. The hitch change was a running change (we started putting them on when they came available) and is going on both lines.
We do not list the 7500# hitch in the literature, so those that got it, got it as a bonus. But again, we did nothing to the unit itself (just a minor change to the hitch construction) so any Class IV should work as long as its the right width for the frame rails.
PLEASE do not send questions via Private Message, my inbox fills up too quickly. Post questions in the forum as a new thread so that other users can benefit from the answers. Use Private Messages for sensitive information only (VIN, Contact info or things you do not want the public to see).