Thin metal stamped truck frame? What is this, 1940? Nobody does that anymore. The resin I'm printing them out of should be able to handle the load. I know the Siraya Tech blu would, but that's overkill for truck sideframes.
Placement of the clasp brakes is just mocked-up here, as the test piece proved too narrow. Final one will be higher, closer to the wheels, and fit across both sides into holes in the sideframes. Importantly, they clear the coupler!
