These would be great in a permanent installation. I can't imagine trailering such an instrument on Aussie dirt roads
We had the 3RF 22" binoculars up and running a few years ago at Coonabarabran- they are awaiting installation of a mod kit which will improve some of the shortcomings.
As these designs mean you look down into the eyepieces I personally prefer shorter focal length. I think a 16" F4 bino would be about the largest instrument that would fulfill all criteria for ease of use ( feet being on the ground most of the time would be a big one ) . A pair of 17mm Ethos permanently bolted in would be good too.