<map lat='62.388' lng='17.32' zoom='12' view='0' country='Sweden' float='right'/>
Sundsvall is a town of 50 000 inhabitants located in the middle of Sweden.
Your best chances to hitch towards North is to find a motorway ramp in Skönsberg (zoom in on the map to the right).
For going south on the E4 you can stand next to the road behind the central station. Cars can stop on the hard shoulder. A far better place is in Njurunda ("Njurundabommen") but it is located 17 km outside the city center. In Njurunda there is a petrol station just after a speed-camera which ensures that the cars drive slowly and there is plenty of space for them to stop.
Alternatively you may want to check out the parking lot by the "inre hamnen" (one minute walk from the central station), usually there are a few trucks parked, taking a break, and it should be possible to find a ride to both south and north. Across the small road from here, there is a Shell petrol station and they throw away plenty of sandwiches, sweets and other food; the dumpster is in the back and you may need to jump over wooden fence to get in.