I have ta similar model Sensar batwing antenna in the fixed configuration on the house here and it works quite well. BUT!. I did buy one of the RV versions but the clearances required made it impractical for use on my 16' trailer, even without having an AC unit to clear. I can't imagine it would work well on a scamp
either, but they do put them on the roofs of Airstream Bambis, so who knows? I laid it on the roof, took a look at the recommended clearances and put it back in the box.
If you do want a rotating amplified antenna, for about the same price as the Winegard I would look at one of these King Control Jack antennas. They have a rotating model that does not fold down and has a much smaller footprint. If I remember correctly they have a 12V amplified version that has some kind of VU meter on it so you can see signal strength.
I think you could find it cheaper but that's just for reference.