[MMI Enterprises]

Sounds like what you want is Project Management or Inventory software (look on downloads.com) but taking inventory everyday by way of imputing numbers seems abit intensive. Taking inventory by way of comparing what is in yard to a printed daily calendar schedule off a program like Works Calendar that you can hand to your guys everyday might be more suitable. If the item is on the printout and it in yard then they clean it and they can then check it off the list and turn back in for you to bill out. Job descriptions could go off license #'s like #*** truck or #****loader. Could do a different calendar for each account or ya could tack on a location name on end of each job description. If an item missed getting cleaned it will stay on a desktop or laptop popup screen till you dismiss it. If they get pushed off too long or not done on regular day then you change the start schedule date for that item to the same day it did end up getting cleaned and that way it setup for the next soonest time your allowed to clean it.
I know it not exactly what yer after in way of info sharing between accounting, project, and inventory on the fly but that all I got without knowing what quikbooks or other accounting softwares have built in these days in way of inventory,project, calendar stuff.