Thanks #40fan i will look tomarrow in the day light.
Rvcircus your right im more than willing to put time into this camper if theres no major rot.
the vent cover is cracked into peices which is why it was leaking, and the duct tape didnt stop it lol.
i did pull a few ceiling panels and the roof structure looks solid and sound with no eveidence of leaks except for the framing around the vent that was leaking, which is nothing for me to repair. once this snow passes over this week we are suppose to have some decent days next week i am going to pull a few wall panels off that are easy to access and see what the wall structure looks like. i cannot see any noticeable leaks inside or out.
he did leave the front window cracked in the front where the fiberglass cover is but theres no show of water leakage or anything so i think thats where the mildew smell is coming from, plus the camper has been sitting for the past 6 months. i am willing to do some work as i have access to lumber extremly cheap and theres a rv place up here that sales new scratch and dent parts and panels that i can get really cheap so i think with a little bit of money and time it could be a really nice camper for minimal money! thanks for the responses everyone!