"Many have to deal with decaying aircraft, shoddy maintenance, flagrant and safety-rule violations. We are seeking Freight Dogs who are interested in being a part of this series with interviews as well as video clips of your travels."
As others have said, Freight ops are just as Regulated as those with Pax and, where there are issues, crews will be working hard to resolve matters in a professional manner - not by jumping on some sensationalist "fly-on-the-wall" programme. After all, why do all the current "Airline"-style programmes focus 100% on the problems encountered by check-in staff and troublesome Pax? Because the flight deck is sooo boringly mundane that the viewing figures would plummet if the cameras were concentrated on the aircrew! Unfortunately for your venture, cases of stroppy cargo are actually quite rare - though the "Strangest Freight" thread makes for an interesting read - so, not really much hope there for you either.
Sorry to pour cold water on this but I really don't think you'll have much luck with this venture - certainly with current Operators. Now, stories from flying back in the 50's and 60's - that would be interesting for us pilots - but, again, probably not good for the viewing figures! A one-off programme? Maybe. A whole series aka IRTers or Deadliest Catch? Mmmmmm......