I think there are few vehicles produced specifically for this limited role today  IFVs give infantry significant integral fire support especially the Sovietdesigned BMP with its mm gunlauncher  Modern main battle tanks fire a large HE round and large forces employ tanks and infantry together  The Soviet Union for example deployed the S and S howitzers with forward units to provide heavy directfire support but also work as a general indirectfire artillery piece fulfilling the role but more flexible      Z