Luggage on Pudong Airport Shuttle Bus Line 5

We are family of 5(3 young kids) with two large 28" luggage's and several carryon bags. Trying to see if the Airport Shuttle Buses from PVG to Shanghai Railway Station on Bus Line 5 is doable with our luggage's. I assume they have luggage storage underneath or they more like city buses with limited area to store luggage.

If not bus:
Are there plenty of van taxis at PVG terminal 2 for family of 5 with luggage's and approximately how much to the Railway Station?
How about subway, is metro line 2 transferring to metro line 1 up to the Railway Station manageable with our luggage's?