1 Heavy hitter, such as the AMR
1 automatic weapon
1 Unarmed/Melee weapon
All the stimpaks you can carry
Chems, especially Psycho, Med-X and variants thereof.
The best ones you can find.
Armor depends on feeling. In my experience LR enemies either can't punch your armor ("Marked Men") or they kill you with one or two hits (Deathclaws) no matter what you wear.