Looks like the Wooldridge tractor is going to work easier than Heil tractor, fair amount more room inside. It should have room for the bigger black-can 12v 90 degree gearmotors.
I need to look into possible motor swaps for the Silver-can gearmotors i ordered to start with. If i can find some, nice 6v rock-crawler cans could probably turn 'meh' power into a beast
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Looks like the smaller silver-can "jsx-370 series" boxes are maybe 370 motors?
The larger black-can "jsx-31yz series"
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Also I found another TournaPull build, starts with a Nylint Tourna-rocker then finding drawings for real one and 3D printing. Also has some narrow gearmotor info and motor swaps
https://www-modelltruck-net.translat...tr_pto=ajax,nv