check this shit out, my bike trailer has a handle now! :D
same as photo one, but seen from the front of the cart, illustrating the walking-compatible height of the push bar.
flatbed bike trailer now with foam-covered push bar attached to the also-removable side cargo cage walls via two vertical aluminium bars attached to the cage with 3D-printed wedge-shaped objects which hold the bar and also stabilise their location against the cage, as seen from the back.