Sue,
Go to an RV Store and get some roof patch cement if you can. Caulk the holes with that, and then go over with the plastic. Yes the sand bags will work. More wind = more sand bags..
I have done this on the same kind of structure you live in.
PM me if you have more questions
EDIT: Where is it leaking, and how many places?
Edited by Desperado (09/17/09 06:55 PM)
_________________________
I do the things that I must, and really regret, are unfortunately necessary.
RIP OBG