Me doing a full leg workout Mon and following with a 5 mile trail run on Tues is not optimal for my lower body recovery.
Going to have to rephase shit a bit.
weight training & serious running is..OK but as you wrote not before a serious run or Ruck as you guys call it.
If you are training for as they call it a "tough mudder" or any serious assault course type events i would advise a body weight type training with chins/pull ups & basic push ups. Legs High rep stuff no ego squats.
staminia is the king. I saw big guys suffer on runs ..always be muscular but not like the Hulk.
I like how the US Navy Seals train, they have upper body strength & lower body plus staminia