Doug, I expect to be in a tent again so put me in the site sharing pool. Been shopping for an RV but not in a hurry, still researching, not sure when I'll actually buy one if at all. I also have a pop up canopy and an old school tarp type canopy that uses poles and stakes that I can bring if we need it. We'll also probably need our own tables and chairs if we go with highland hammock with no screen room. I have the 6' folding table I brought last year and can most likely borrow another like it from my neighbor. Also have a stack of 6 plastic Rubbermaid chairs but not sure what I may be able to borrow.
On a side note, did you try to leverage fisheating creek with the threat of moving our gathering? We could also pass on the group site to save $$ being that we only had 4 or 5 tents there last year. I think they also allow more that one tent per regular site and those sites across the road looked pretty nice and are certainly close enough to keep the group together.
I see this highland hammock is a state park. Wondering what their alcohol policy is?