ACKNOWLEDGMENTS Financial support for the projects covered in this paper is provided in part by T-REX Geo-Seed Grant Program and by the US Department of Trans- portation, Office of the Assistant Secretary for Research and Technology (USDOT/OST-R) under Grant No. 69A3551747126 through INSPIRE Univer- sity Transportation Center (http://inspire-utc.mst.edu) led by Missouri University of Science and Technology. The views, findings, and conclu- sions reflected in this publication are solely those of the authors and do not represent the official policy or position of the USDOT/OST-R, or any state or other entity. The four-wheeled structural crawler was designed and manufactured by Dr. Hung La from the University of Nevada – Reno as part of his technology transfer to the INSPIRE Center. Thanks are due to undergraduate students (Derek Edwards, Daniel McDonald, Rueil Manzambi, and Joseph Ressel) for their assistance to execute technical tasks. REFERENCES Alhaj, A., H.L. Qu, H. Zhang, G. 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