Laptop recommendations?

I get 3 years out of a laptop on my tool truck regardless of brand or price. (hostile environment) I have spent $300 up to $3000 and get the same results. My last 2 (and present) are Toshiba's and have had good luck so far. The $350 one I am using now I modified with a better and larger Seagate hard drive which I have found is a weak link with cheaper laptops. Good luck. tmm