I am not a professional hauler, most likely to be on the other side of it (needing things hauled long distance). I understand that it can get pretty frustrating having to hear from those folks that all of you describe over and over and over and over. How about looking at it this way: How many quotes do you give and how many actually turn into a job? Lawyers, roofers, car salesmen, all have far more "contacts" vs. actual sales. Let them rant and rave! I know of a individual haler that prepared a quote sheet where he writes in the current haul price, but also has a Q&A section where he breaks down in general terms his monthly expenses. Rig, repair, maintenance, insurance, fuel, fees, etc. Rather than only verbally giving the quote, he just hands them the sheet.
On another note: From my own experience, it is hard to get someone to haul locally (under 100mi.), even with standard allowances for loading/unloading. Therefore, I ended up buying a GN to do it myself. However, on longer hauls, I do expect a small discount over the "right now", designated haul if time is not an issue (within 30 days, for example) and/or known partial load.
Just my 5 and a half cents worth. Ralph in Oklahoma.