Just some thoughts, for what it's worth.....
If it were me, I'd probably deploy with my unit, and get a taste of how AD is first. Going with your
unit, you know the guys, their good & bad points, and they know you. Versus getting thrown into the
pot cold, and not knowing anybody.....
Having been in a light infantry unit during my Guard service (talk about a fish out of water - going
from tanks to humping your ruck everywhere....), ISTR that they told us that 1/3 of your bodyweight
is the 'standard' for what you might be humping, with over that 'as needed', etc.....
And the motto of "what you're carrying is what you have to fight with" fits oh so well. If you wanted
it, you packed and carried it, since your deuce & a half might be far away, or carrying other more
needed supplies.
We never went on runs with rucks, but that was also NG, so....
My recommendation, if you're going to go Light, spend the $$ for a good pair of boots. You'll thank
yourself later!