People do it, I wouldn't. As a cyclist my bikes can be fairly expensive. I would think they would end up scratched up, not to mention the wear and tear and possible separation of the ladder from the MH.
You mention your receiver is in use, but we tow a car and use a dual hitch receiver with a hitch mounted swagman bike rack.
Been using this setup for years with no issues.
dual hitch receiver.
Jeff - 2023 FR Sunseeker 2400B MBS