@Galapagos Penguin , I will echo
@Neil chace and
@Great Argus in saying that no matter the situation, a RRH and crowned crane mixed habitat is not one I would reccommend. RRH mixes almost always end up going badly because they're either too orney for their own good or they end up going after or injuring other animals. I've heard stories of them being kicked unconscious by okapi, gored by nyala, and attempting to catch and eat bat-eared foxes. Being highly intelligent, their personalities vary greatly, so mixes can work out for extended periods of time just because of the specific pigs or specific individuals of the other species. It's always just a safer bet to house them separately and to not use birds as fancy lawn ornaments in mixed exhibits.
I have personally worked with both RRHs and warthogs, and it is true that warthogs are generally more even-tempered and less destructive than RRHs; however, that does not mean that they are still not ornery pigs

Males, especially, with their much larger tusks are more of a threat, if provoked. The warthog mix at the SDZSP fell apart after introducing new pigs that were less tolerant (they always had to be separated when either species had young), and Caldwell also no longer has warthogs in their mixed savanna (they recently switched them for RRHs, which I will be interested to see how
that goes, as I can definitely see an ornery RRH being much too confident with one of their Grevy's and not coming out as lucky as the RRH that took on an okapi...)