hey man, this might be a bit late, but I just got some 6384’s. Will be dual setup with the motors behind the rear wheels.
re: Trucks for street setup, so 8-10mm rear axles, you will be able to use:
The DKP trucks on Flipsky.net , 13.78" only (sold out as of 15 Oct 2020) because the hangar is 178mm wide and they need to fit 2x84mm, so 168mm wide of motors while you have 10mm free if you tighten the truck plates right at the end of the hangar and assume the motor mounts that fasten to the truck plates run flush with the truck plates and the faces of the motors. Giving you a little 10mm gap between the 2 motors.
The Torqueboards extended 218mm Caliber II clone trucks. Same reason as above. Hangar is 218mm. And that will give you a decent gap between the motors. Edit: https://street-wing.com/ seem to say the axles are 8mm. Which seems odd.
The Trampa Ultimate Titanium trucks. Same reasons as above. Hangar is wide and will house these 2 motors with a decent gap.
As for the motor mounts. I’m more for speculation. But for every site you find these trucks, there will generally be corresponding mounts. The woosh mounts seem to fit all of the above. I could be wrong. Please correct me if so.
Otherwise, that is my take, cheers