Whenever I see posts about the number of carries I always wonder why no one seems to consider post season and preseason carries. For example since 2002 LT has had 9 preseason carries to Alexander's 106. If you include postseason LT 26 SA 95 The career carries is now
Alexander 1918
LT 1737
To further increase the wear and tear factor Alexander has averaged 11+ games on turf per year (8 home games, 2 preseason games, 1 at St.louis +random other domes) LT plays on grass at least 13 times per year (8 home games, 2 preseason games, all division road games)
8 of the 16 NFC stadiums are turf.
3 of the 16 AFC stadiums are turf.
So I guess we should increase the wear and tear on most NFC backs, prennial playoff contenders and RB from the 11 turf stadiums. Wow this was a fun way to waste time at work!
To answer your question in a keeper league I would probably go LT then Johnson with Alexander behind that simply because you should be able to get one or two more dominant seasons out of the first two.