DSM56,
On my ’93 Liberty H3-40, there’s a release mechanism I’ve barely noticed, but I’ll try to explain it.
In the middle of the bumper, behind and just above it, there’s a lever that you can access from underneath. It feels similar to the hood latch on my Ford pickups. Moving the lever toward the passenger side releases the latches at each end of the bumper, allowing it to drop.
I’m away from my coach until early January, so I can’t confirm whether the outboard latches are cable- or rod-connected.
Inside the dropped bumper, there’s a diamond plate step feature that I assume can be removed for a closer look. Once I’m back with the coach, I can check and provide a photo of the mechanism if needed.
Let me know what you’d like to know! Hope this helps.
Chuck