I have a $600 trailer I was very proud of and have kept it in the garage so it hasn't rusted. Meanwhile we leave $70,000 worth of cars out in the driveway etc getting them covered with muck and rain - go figure!
What I mainly do is ensure that everything that went out at night is thoroughly dry before finally packing it all away. I do check optical surfaces for dust and marks and see if they will come off easily otherwise leave them. I've wiped a few too many eyepieces at night with my hanky to get the dew off - not a good move!
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