Panasonic's Toughbook 55 is classed as a 'semi-rugged' laptop, which means it can cope with demanding environments, if not the very harshest -- for that you'll need a 'fully rugged' model. The Toughbook 55 features a highly customisable design that allows users to specify and swap in (or out) the components they need, which is very welcome. As ever with Toughbooks, this is not an inexpensive laptop -- but you're paying for its ability to go where other laptops fear to tread.
Panasonic Toughbook 55 review at ZDNet