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#1  

Just click on the yellow "Store" button above. D.J. has some tanks. I don't know how big.

#3  

You might check rctankcombat

That is where I got my ideas for my robot Magnus. See the thread at:

Project Magnus

Here is the link to the tracks I use. Tracks

The company has a robot customer service team to help you with creating your track system. They can be contacted at

[email protected]

I can get you the part numbers if needed. It was about $150 for the tracks and the sprockets.