My custom LEGO Technic 40th anniversary tow truck. I added headlights, replaced the rear wheels with tank tracks, and added 2 small power functions motors to the bottom for extra torque. :
Amazon.com: Battle Brick Deluxe German Half Track Sd.Kfz. 250 WW2 Custom Set : Toys & Games
IDEA] custom mini tracks - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
How to Build a Track for Some Small Lego Tank (MOC - 4K) - YouTube
Lego custom tank chassis part 1 - YouTube
Sariel.pl » custom tracks
Sariel's Bricks & Pets - Here's another take on the slipper custom tracks issue. The gear is a LEGO Expert Builder gear from the 70's (part number g15) and while it meshes