Never really looked at camping in the area, If Im riding Holmes county I doing it from my back door. There is camping in the area yes also a lot of B and B type places. The Trail gets a lot of use round the clock. I wouldnt worry about it.
Killbuck to Brinkhaven, No not open yet nor will it be offically open for soem time. Is it rideable? Well I quess that depends on what you are riding.