Post notices on hiking trails/visitor center. Leave notices at local and regional police and fire departments and ask them to post for their employees to see. Include pictures as most won't even know what a Basenji looks like. Also let them know any special recall words you may use in case of an emergency (ie…mine is "Ty, Kate, CHEESE!!!) Leave fliers at ALL vet offices, with any special needs your dogs may have.
Good luck. My prayers are with you.