I ran across one somewhere on the net, but I couldn't find it again.
Having said that, after staying at FW, that map just couldn't and didn't show how much space you have between your sites, how your rig backs in, and whether or not you will like the specifics of that site.
Maybe you should try to make reservations in a loop based upon your preferences, such as proximity to pool or marina, cable tv, pets, etc. and then I would call FW campground directly about 2 days before arriving, and ask them that if you arrive a few hours before check in could you scout out the available sites for that time. Maybe they'll say no, but it's worth a shot. I do know if you don't like your site, they will try to accommodate you at another site.
Again, the site map that I saw was very accurate, but could not reflect the important nuances of the sites' relationships to each other.
Cluemeister