There's 1 patrolling trooper that comes close enough to agro you if you're standing in the firepot at max trade distance. You simply walk around the corner when he's pathing near.
I don't think you have to stay away - it's only his pathing towards cab where he sees you. I think he leaves you alone when he paths out. It's been years since I did this on Mcoy though.
-Mcoy
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