Please do a search on this subject as it has been clarified many many times...not your fault of course, just there is sooo much info on this out there, but the quick of it is NO you do not need a Tow vehicle pass unless you plan on towing a car behind the tent trailer, and I highly doubt it. Those are for those huge rigs that tow an "extra" car around.
they tricked me into buying tow vehicle passes. Was not explained very clearly in the beginning. i now have two tow vehicle passes i need to sell. they won't refund said i need to try to sell them here. They have since explained it much clearer. o well live and learn. have a great day:]