You're not reading what I posted... You're only reading the first sentence of each code section and ignoring the rest. While in your case, the provisions described in the first sentence do not apply, if you would read the entire code section, the other provisions that are described in the remainder of each of the code sections do indeed apply!
Furthermore, and instead of repeating the same information you initially came with, you might want to try to answer the questions that were asked.

Quoting
buyer2476
The stop was at about 11:00 in the morning so no dought it was not operated during darkness.
CVC 25300(a) Every vehicle which, if operated during darkness, would be subject to the provisions of Section 25100, and every truck tractor, irrespective of width, shall at all times be equipped with at least three red emergency reflectors. The reflectors need be carried by only one vehicle in a combination.
That means two things:
The requirement to have reflectors on ALL vehicles that are operated during darkness is subject to the provisions of 25100... This part in not relevant to you. But, 25300 continues to say: "every truck tractor, irrespective of width, shall at all times be equipped with at least three red emergency reflectors".
Notice the "shall at all times" be equipped with at least three reflectors. So arguing that it was 11:00 in the morning will not get you from under a requirement that applies ALL TIMES (including 11:00 in the morning).
And before you come back to say your F450 is not a truck tractor, this is why I said you haven't shared with us how you use your F450 or how is it set up to carry/tow loads or other vehicles. Fact is it can be set up to serve the same purpose and even if it only qualified as a motor truck (see definition in my last post), it appears all provisions that apply to motor trucks apply to truck trailers and therefore I'm not feeling how or why a judge will dismiss the charge on this one.

Quoting
buyer2476
The officer cannot prove that I was being compensated so how can he say that it is a commercial motor vehicle.
Where do you get the idea that using it for compensation is the only way that would qualify it as a commercial vehicle? Besides, are you saying that you bought/leased your F450 for what.... its fuel economy, its comfortable ride and its sportscar like styling and handling? Were you out for a cruise with the family at that time only to get pulled over?
Again, read what I posted and you'll understand that under CVC 34601(c)(1), any self propelled vehicle that qualifies as a motor truck with two or more axles is defined as a commercial vehicle.
In fact, go look at your license plates, do you have regular plates or commercial plates? And if you have commercial plates then by definition, you have a.... (wait for it)..... A "commercial vehicle". Now, if yours -at the time you were pulled over- exceeded the 10,000 pounds gross vehicle weight rating, then you shall have displayed on both sides of each vehicle or on both sides of one of the vehicles in each combination of vehicles the name or trademark of the person under whose authority the vehicle or combination of vehicles is being operated. You don't get to enjoy the privileges of a commercial vehicle and then when you fail to meet your responsibilities for having one you say "they can't prove I was using it for compensation". Well, on second thought, you can but you will lose that argument to the tune of an additional $172 in fines...
Fighting this citation on the grounds you offered simply means you will be ordered to pat $397 in fines. All while you are expecting to skate through by only paying $50. For correctable violations, you have until the date shown on you notice to correct the violations, get the notice signed off and submit proof to the court along with $25 per correctable violation. Otherwise, submitting it too late means you'll have to pay the full fine. Your money, not mine... So do with it as you please.