The Truth Trucks absolutely do work. My good friend at NATIONAL AMERICAN HOLOCAUST MEMORIAL has had one himself for over a year now, used others for several years and has said many women have not gone through with planned abortions after having seen the pics.
I know the same has happened with simple pro-life bumper stickers and other signs. It certainly does not work everywhere or every time but it has in fact saved many.
From Holy War in Wichita http://cpforlife.org/id216
a picture is worth a thousand words!