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Just my thoughts but it's good to get up to 12 every once and awhile to see your long distance pace, feet problems, and water consumption. Pay attention to your per mile pace and try to remember why you were fast or slower for those miles. It can be something as simple as opening your hips up more, having your head down, extending your stride, etc. I think those long rucks really bring out good and bad habits that make the difference.
As far as going up to 18- if I can do 12 I can probably do 18 just fine and I feel you can spend your time in the weight room and get more benefits than those extra six miles will give you. I can always increase either my pace or my ruck weight to get the same or better benefits adding miles would do.
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