Take as many trips as it takes. Those 3 minutes don't matter. You're just going to use them on Lemmy, anyways. Don't strain yourself and don't risk dropping anything. We're all getting older and minor injuries take forever to heal now and if you throw your neck or shoulder out say goodbye to that stuff you wanted to get done this weekend.
My state banned bags, so if you forgot to bring your reusable, your SOL. And it's a non issue with those huge reusable bags, no longer do you have a dozen plastic strapping with knife like force cutting into your fingers.
Although I would love to see someone carry a dozen of those cheap paper bags in one trip.
My shopping trolley carries a literal trunk load of groceries. I walk it around town for two hours every week. Car-free is carefree, I don't give a fuck how it looks.
I've only had two over the course of four years so I'm not qualified. I will say this: if you're going to be walking outdoors a lot, consider avoiding ones with the triangle of wheels that go up stairs more easily. The smaller wheels are significantly louder on rough pavement.