I have been buying used Dell corporate laptops based on my experience at work. The ones I used were very reliable in harsh conditions like on the hood of a truck in 90 deg weather and outside when snowing. The parts are unlimited and cheap. The E6410/6420 are solid machines. I have been running Win10 on a used D630 for about 5 years.

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Tony H
W111 280SE 3.5 Coupe
Manual transmission

Past cars:
Porsche 914 2.0
'64 Jaguar XKE Roadster
'57 Oval Window VW
'71 Toyota Hilux Pickup Truck-Dad bought new
'73 Toyota Celica GT