i think the reason that 20 people have read your question, but not responded, it because they probably didn't know what your were talking about.
ok, what do you mean, by "only a tow hitch" with no brackets?
do you mean a receiver? (either a 1.5" or 2" square opening where you would mount a hitch?)
if you dont have any brackets, how do you mount something??
please clarify and maybe somebody will get back to you on this and help you out.