@geerlingguy - thanks again for asking. I thought I could put more content into a Gist to explain my difficulties.
So, first of all, I wasted a LOT of time thinking that my share was not being mounted, when it actually was. The output of my
vagrant up w/o NFS enabled on Windows shows me that my synced_folder is being mapped correctly on the guest OS. When I enable NFS, and run
vagrant up again, I am missing this same line. However, if I
vagrant ssh into the box, I can see that the folder was in fact mounted correctly... Unfortunately I didn't TRY that until hours into troubleshooting.
My next issue was actually getting winnfsd to work on my computer. I dont know if you have seen this before, but I realized that the only way to get the nfs shared folder to work was to specify SOME mount_options in Windows. It seems that the mount command was failing over and over again when that variable is empty. I'm not even EXACTLY