The official website of Dodge trucks and vans is RamTrucks.com, and has a section dedicated to commercials for Ram trucks and vans. There are also several official and unofficial video uploads of the Dodge van commercials on YouTube.com.
Typing in the keywords "dodge van commercials" produces several places to watch the Dodge Ram van commercials. The official Dodge Ram YouTube hosts every commercial released to the mainstream media for the past several years. Some of the more popular commercials currently out are the 2014 Dodge Ram Pro Master Commercial van, the 2015 Dodge Ram Promaster, and the 2014 Dodge Ram 2500 Promaster.