I have the Atlas AT-50 with wobble base, with the whole works mounted on a small 40" X 48" trailer. There is enough room for the battery and a couple of boxes of clays as well. This is all set up to tow behind my ATV.
The wobble base has separate motors for azimuth and elevation, and can be switched on or off as desired. They are not in sync, so the angle changes constantly. Of course, you can set any angle you want and fix it if you are training beginners.
I built my own foot release, but need to modify it as the trap keeps throwing as long as you hold your foot down. It's kind of hard to remember to take your foot off when you are trying to concentrate on the birds.
I have not had any problems with this unit so far, and don't expect any.
Send me an email at jim.n.wooten (at) juno.com and I'll send you a photo or two.
HHH