On your mark...get set ...WASH!!!
Andy,
I'm assuming that these trucks are Econoline sized vans (?)
Hopefully white
I 'm also assuming these trucks are "home garaged" since you can only wash them during a saftey meeting.
If that is the case, then you will be whipping through these puppies at a pretty good pace. The customer will need to be advised that to wash with the amount of road grime a truck picks up over a months time and the amount of time that you are given, the best that the customer can expect is a "utility wash".
Unless....
You can workout another washing schedule.
For example, we wash cable trucks in the morning as they are coming in to pick up their schedules/supplies. It's not the best washing situation since everyone is on the move, but the job gets done.
We also wash cable trucks on Sunday. They have provided us with their gate access card and it is coded with a Sunday time slot. We have to wash within the hours of lets say 7am to 4pm.
You might also ask how many trucks are not taken home and are parked on the property at days end. You could wash those trucks on one day, as Dan mentioned and than on the day of the safety meeting wash the ones that are not on site at all.
What methods are you currently using to recover wash water?
(We use drain pillows to cover the storm drains. We pick up the water around the pillows using a device that hooks up to your wand.)
Generally speaking if that method is used, that would be something that wouldn't necessarily slow you down.
Bridget