Is it possible to store your luggage at the station at Hoi An and Dong Hoi?

We are traveling to Vietnam July 2-11 and will fly into HCMC and out of Hanoi. We would like to take the train from HCMC to Da Nang, spend the day in Hoi An and then continue on train to Dong Hoi, spend the day at the Phong Nha and then travel the rest of the way to Hanoi. We will have regular suitcases with us as this is a vacation before business in Phnom Penh. Is there a way to store luggage at the train stations? Should we hire drivers for the days we are in Hoi An and Phong Nha? Thanks