Re: Oh, yes, contractor installs..
Where would be the fun in that? :)
Also, in those days, laptops were not the nible lightfooted devices we have today, they were better defined as luggables. A battery life of seconds and a boot up time which blew most of that charge demanded that you also had to lug a power supply along.
I could carry Psion Seria 3A in a pocket of my overcoat, including serial cables and a spare set of penlights to stave off Murphy's Law of batteries. No contest for this specific job :).
(come to think of it, it probably would have required the laptop to be screened prior to connection to anything there).