$14k is not such a large amount of money that you couldn't recover if things didn't work out with the unit. it might be painful for awhile, but not devastating.
have you asked if you can tag along with the owner to see how he runs the truck? it might give some insight as to what he has to do to make it work for him.
Head Cook Water Tower BBQ
Coming this Fall.......BWS Extended Party!
BWS Competitor (sold 2012)
WSM - 18.5" - 2009 (sold 2011)
WSM - 18.5" - 2004 (sold 2010)
Superfast Orange Thermopen
KCBS CBJ, Railroad Detective