Now you got me wondering what crank you was working with.
Does your trailer have the crank-up type TV antenna. It may have come with a roof mounted uni-directional type antenna that doesnt crank up.
The all around best antenna for HDTV looks like this google photo when cranked up.
You might want to try all of this out before you head out on your trip. Using the BATWING antenna for picking up OTA NATL BROADCAST TV is more to it than just cranking up the antenna and turning on the TV set. I would try all of this out in the driveway to learn what you need to to do...
We did everything in the driveway first. Even camped out there for a few nights learning what all we needed to have to make things work...
Still sleep over night in the back yard alot actually haha...
Roy Ken