Caterpillars 8800 series is produced for the civilian market but they can’t quite hide their military heritage with gun ports in the side and rear doors and the mounting for the roof turret (not fitted on this model). This one “Brobdingnagian Bob” was part of the Mars mission of 2109 and was used as a supply and support vehicle for many years. Fully equipped with mapping and recording gear , a drive through hanger and 2 massive turbines to supply power to the drive sprockets it was a testament to Bob’s rugged construction that enabled it to withstand the close impact of a meteor with little more than some scratched paint. Really happy with this one , took about 3 days on and off, except for the running gear, did that months ago but didn’t know what to fit it to. I hope to do some more different versions latter. Uploaded 2 files to my Sketchup page for download, about 17megs in all.