David, Welcome to the good ship, TF! Here's a link to some tips on posting and customizing your account to your preferences. Lemme know by private message (PM) if you need further help with posting.
I'm the guy who spoke with Gil and Jule Marshall several years ago when I was researching my hull history. This was during the period that Gil was running Navigator Yachts and his Dad, Jule, was still coming into the office every day in his 80s. Since that time, Gil sold Navigator and I have no contact info on them. Perhaps a call to the present owners can provide you with some information.
Tell us more about your 30. Is it called an LRC? I'm very interested in performance, specs and fuel burn. How much fuel, water and holding tank capacity? Pics are always appreciated. How's your ER space? Does it run from the steps to the transom? Do you have an accurate weight on the vessel?
I think you've got the makings of a near-perfect trailer-trawler. She sure looks purty!