I might help a little. I installed the King Jack antenna on my class b motorhome about 4 years ago. They had just come out with the antenna. I replaced an omnidirectional saucer shape antenna and got 2 times the channels sitting in my drive way. I used the self leveling caulk (dicor) all around the area. I had to build up some courage to drill a 2 in hole in the roof.
I get close to the same amount of stations with my 179 pod's antenna so I don't think I will replace it right now. I was able to use the same location as the original antenna. You are right, it will be dificult to install in the Rpod to access the handle below. Good luck. Please let me know if and where you put it.