John wrote:
"Looking for any ideas on a "No Ground" HF antenna to mount in a
motorhome."

John must want an antenna which needs no physical connection to the
earth. Any balanced antenna requires no physical connection to the
earth. Also, many unbalanced antennas have no physical connection to the
earth but use the motorhome as a ground return for the antenna.

How about a screwdriver HF mobile antenna?

A wire suspended above the motorhome can turn it into a loop antenna.
Phil Rand, W1DBM, now an SK, did this to his RV with good results which
were published in QST and one of the ARRL Antenna Compendiums. I don`t
remember which issues.

Best regards, Richard Harrison, KB5WZI