Warning, this subject is old (5659 days without answer)
DAR1A-4L
A van from episode 2 season 5.
After a quick research on the internet, I'm almost sure it's a 1955 Ford F-100 "Panel Van"
Here's the photo :
VoilĂ !
[EDIT] : This truck is used a few seconds by a delivery boy who brings to Quinn some flowers.
Link to Daria page :
http://www.imcdb.org/movie_118298-Daria.html