Unit D2: CaseIH Steiger 400HD Dualed Articulated Tractor w710s Posted on January 10, 2019 (January 12, 2022) by Alex Barrie in Compaction Test Results Datasheets Plot Comments D2_3, D2_L_3 This Unit was tested at the _3 installation.This is a wheel tractor, comparable stress at depth effect compared to D1 as even accounting for lighter axle weight.