I just looked at the Ram site, it's back up, and they have released a bunch of new items since I was there last.
And my wife says I should apologize for the cluttered background on the photo.
As I mentioned, once you have the cradle and arm pieces, all you have to do is add a different base for each vehicle and you're good to go. Or add a different "top" for a new piece of electronics such as a PDA or cell phone. Mount your phone on your tractor! Don't have to worry about it coming off your belt or out of your pocket.
I'll bet the rig shown in the attachment would mount on a ROPS!