They are kind of like a mini Balikpapan, about half the capacity and the same speed and similar range under load.
If I pick a possible operating area, say through the Philippines, then most islands are comfortably within 50nm. If you had a pair of LCMs shuttling, then that's about 6-8 return journeys in a 24 hour period.
I think we have 18 of these things in the eventual fleet, so assuming 12-14 could be available to an expeditionary force, these could move in the order of 36-50 Redbacks daily. Or twice that in boxers. Or four times that in Bushmasters. Or some combination thereof.
Army logistics is not my skill, but that seems like a lot of movement. Would a littoral foce need to relocate more frequently than that.
I think these vessels are useful if the travel distance is short. Conversely to the above, if the island hopping is say 300nm, then the efficiency drops significantly. The LCHs would be the better transport unit in these cases.