I always like to look at the whole package, you never know what someone may try to hack up.
Just because it's in a rack doesn't necessarily mean it's indoors. My TX lives in a road case and spends quite a bit of time with nothing but stars over it
Battery power is appealing if your operating from somewhere where you are not necessarily welcome, someone's field for instance, or back parts of a park. Generator power in these instances, even with modern inverter type generators can raise the 'here I am' flag, as if a tall antenna didn't say it already.