"It is a law immutable that the further you are to travel, the more you must carry."
</Austen>
Read Ranulph Feinnes' "Mind Over Matter" which IMO is absolutely essential reading for any serious randonneur.
In the first part of the book he explains in great detail, the logistics of setting up a one-man crossing of the Antarctic and why, as he set off on the first steps of this epic journey, it took several attempts just to actually start moving at all, his load was so heavy.
(Though the best bit of the story is when, after many weeks of travelling alone, he arrives at the South Pole - he is so traumatised at the prospect of human company that he just presses on past, without stopping.)