Need to get from PuDong airport to Hangzhou

I will be arriving October 18th (thursday) at bout 5:30pm, I've been told that customs can take an hour. I will being flying United and need to know if it is doable and what time you think I should be able to arrive in Hanghzhou and if someone is coming from one of the Zhejiang Universities then which of the 2 Hanghzhou stops is closer..... I also would like to know how far the bus gates are from the customs check..... One more thing I will be traveling alone and with four bags, Do they have carts in the airport to help with luggage and is it expensive?