The USMC pushed to develop a Mobile Landing Platform with the idea that it could perform the function of "dock at sea". Quite honestly we have that covered with the INLS you see below.
What the Marine Corps actually need is a better ship to shore connector. There were a few "super large" LCACs that were on the drawing board but they never came to be.
Which brings me back to the Turkish LCU...check out that load carrying capability!
Those are old M-60's but the load carrying is impressive! The speed is more than adequate especially when considering how heavy it is...and two of these large LCUs assigned to each MPF squadron would double the speed at which we could push vehicles ashore.