Awesome! It's funny how we all motivate one another to build more stuff! I've been keeping an eye out for large tires(8-10") as well at a local parts and surplus store and they had some a while back that would have worked for my brain fart of an idea but I didn't buy any and now they don't have them any more
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I hope you start this build soon regardless of what brand of truck you make. If it has half of the detail that your dozer has it will be amazing!
Reg