These guys: http://www.sno-cat.com/index.asp
They were likely in business back then (neither website, nor the wiki page on the company http://en.wikipedia.org/wiki/Sno-Cat are exactly clear about this, but it seems likely that EM Tucker, Sr was working on developing the machines at this time, if not putting them into production) and potentially could have enabled Preston to handle some of the logistics problems he was having.
