Of course maintaining the flexibility needed to duck under is a healthy choice…my chronic back pain condition requires me to retain as much flexibility in my chassis as possible. I can still roll around on the floor with my grandchildren…
And return unaided to a full upright and locked position without leaning on any of them.
I have a section of my layout that makes use of a rolling cart to connect two sections. The cart rolls away to provide access to a panel with the main water shut-off. The section on the cart gets locked into place before running trains.
It’s O scale three rail so the tolerances for the connection are higher than for smaller scales (as mentioned in another reply to the thread). That said, best advice I can offer is to have power leads not just to the bridge itself but to each side of the respective gap. Although you still have to rely on leads from the bridge to complete the circuit, it can’t hurt to have the boosts of the extra leads on either side.
Dom