One of the things that distinguishes expediters from many other truckers is most (maybe all?) expediter carriers require all their drivers (contractors) to have HAZMAT endorsements on their CDLs. The majority of non-expediting truck drivers do not.
HAZMAT loads are generally no more difficult to deal with than ordinary freight...IF...you have your paperwork in order and comprehend the HAZMAT info HAZMAT-endorsed drivers are expected to know. Acquiring that info is easy. It's in the CDL manuals issued by states and info and training provided by carriers. Comprehending the info and putting it to good use is up to the driver.
For example, I once met a driver that complained about a large fine he had to pay because he was pulling a placarded trailer but the trailer was empty. He knew the trailer should not be placarded but did not remove the stick-on placards because that would have required effort he was not willing to provide. The placards were stuck on pretty good and he had no good tools (a razor scraper or Goo-Gone) to remove them. To this day, he believes his carrier should reimburse him for the fine because "THEY" gave him an improperly placarded trailer. He failed to mention that "HE" was the one stupid enough to haul it down the road when he knew it would be illegal to do so.
That's an example of a driver that received but did not comprehend or practice the HAZMAT info he received. Instead of working hard to remove the placards, he might have easily covered the placards with duct tape (don't leave home without it), but that did not occur to him. Now he's a driver that refuses to haul HAZMAT loads - and thereby forfiets the extra money he could make - because "It's too much trouble."
Regarding the flip-open placards, we prefer empty placard holders because:
1. The shipper is required to supply the proper placards. If that cannot be done, that itself is a red flag to look with suspicion on the load and paperwork. If they did not have the foresight to have placards ready with the load, other things may also be wrong.
2. Laws change about how placards should look. Once, borders were not required on placards (at least some of them). Now they are. Had we purchased non-bordered placards of the flip-out kind, that money would be down the drain with the law change. We do not trust bureaucrats to leave the regs alone. Placard rule changes are likely in the years ahead. Better, we feel, to use the throw-away kind. Rule changes affecting placard images do not then require us to buy new flip-open placards to stay current. Changes are infrequent, but why bother with them at all if you don't have to?
3. Flip-out placards collect road spray and store dried road salt between them. They require extra effort to keep clean. Empty placard holders do not.
4. People at shippers and some jokers on the road like playing with flip-out placards. Once while securing our load, I heard from inside the truck the people outside opening up the flip-out placards for the load. On my pre-trip walk around, I noticed one of the placards was opened to the right color and word but wrong number. Three placards said "Flamable 3" one said "Flamable 2". Oops! How much might that fine have been if I did not notice it and got tagged at a scale?
I also dislike the "joker" risk flip-open placards present. While you are empty and asleep at say a rest area, a michievious person that really means no harm but is just trying to be funny, might decide to flip open your placard to "Poison" or "Radioactive" or "Explosives". In theory, you'd catch that on your pre-trip walk around the next morning. But also in theory, you could be found in violation when Smoky Bear rolls through the rest area and knocks on your door.
I never thought of that risk until I saw something funny at the Louisville truck show. Someone had opened the flip-open placard on on a truck at an expediter recruiting booth where the recruiters work. Among all the glitz and glitter the carrier set up in the booth was a sign that read, "Inhalation Hazard."
5. As often as not, we find ourselves hauling HAZMAT loads where the freight does not match any flip-open placard we have on our truck. We end up having to use the shipper-supplied throw-away placards anyway.
Throw-away (peel and stick) placards carry the risk of blowing away while you drive down the road. The placard holders are not always that reliable. A bit of clear packaging tape helps hold the placards in the placard holders. We do not use the peel and stick feature. Some of those glues go on easy and then stay on, even when you don't want them to.
It's also a good idea to ask the shipper for one or two extra placards in case one does blow away or a joker decides to remove one of yours. Shippers are almost always willing to give you extras.
Finally, while HAZMAT compliance is routine for drivers that know what they are doing, it's not something to take lightly. HAZMAT loads are one area where the much-maligned dispatchers can be worth their weight in gold. While it's sometimes a pain to dot all the I's and cross all the T's in a departure call to dispatch when you are eager to get underway, the attention to detail our dispatchers (FedEx CC) show on HAZMAT loads is very much appreciated.
More than once, shippers have had to redo their paperwork because our dispatchers caught errors that might have otherwise gone unnoticed. We'd like to think we would have caught the errors ourselves before we left, but just the same, it's nice to have good people backing you up.