Why are trucks driving in the inside/high speed and HOV lanes?

The location is Phoenix.
The malfaction are trucks - all kinds of trucks - driving in the high speed lanes and even in the HOV lanes.
Gas tankers; flatbeds; vans; reefers; belly dumps; end dump; all kinds of truck driving in the high speed lane (that's what I call it, anyway), almost always going FAR slower than prevailing traffic and basically - giving the motoring public a new excuse to hate truck drivers and trucks in general.

Now, in the Phoenix area, there are hours of operation for the HOV lane. 6am to 9am and 3pm to 7pm. All other hours, it's just another lane to drive in. Most people don't know that, even though the signs give the hours of operation, but apparently truckers have found this little gem out as well.

So now, we have trucks in the HOV lanes and the high speed lanes, and there is no apparent, good reason for it. They could easily be cruising along just as fast and not blocking traffic in the middle lanes.

I'm at a loss. I don't understand this behavior and I certainly don't agree with it. I've had thoughts of calling the company of each truck I see and reporting them. I don't know if companies even care about stuff like that anymore - I haven't done it yet anyway. I see far too much crap going on on the freeways from ignorant drivers that I have REALLY been considering starting to call their employers.

I DID turn in a driver of a smaller truck a while back. I took a 5 minute video of this person and what they were doing, posted it to YouTube and then called and emailed the company with the URL to the video. They viewed the video and "took the steps management deemed necessary". I was thinking of doing the same. You can call me a traitor to my fellow driver - but a lot of my "fellow drivers" nowadays aren't drivers at all, as far as I'm concerned.

 

That was an extremely intelligent, well-thought response. Of course, I'm driving 75mph in the city on the freeways - I said that, didn't I?
You are obviously clueless. I said nothing about MY speed, I never said I was driving 75 mph, the ONLY and OBVIOUS statement was why OTHER drivers are driving in THOSE LANES?
You're right, I don't sit in the right lane - I keep up with traffic in the middle land and therefore, am NOT holding up traffic. Makes sense to me, but for you?

 

Lol. It's my business cause' "drivers" don't drive in fast lanes and hold up traffic. Those trucks are going at least 10 mph slower than the traffic that is backed up behind them want to go. They cause traffic to slow down which has a cascading effect that goes on long after they've been on that stretch of highway.
My biggest concern is nothing different than the attitudes shown here: You're a big-time truck driver, you can do anything you want! Yeehaw, tough guys, lets get out there and show em' we can do what we want, when we want to.
And people wonder why the trucking industry is hated/disdained/disliked by the general, motoring public.
I'm paid by the hour, it matters little to me whether I can "keep up with big dogs". My little daycab can keep the speed limit - which is 75MPH on most of the Interstate highways in AZ.
The point here? Macho guys - with attitude.
I've never liked talking to brick walls, so go ahead, get your last word in cause I won't be responding to it.