Trainer (?) Or not
Your trainer didn't know the answer? I can understand that something so complicated with exact numbers, weights and measurements would be difficult to remember, especially considering it's not something you would use every day, or often. I think I'd reference the chart anyway, just to be sure my memory wasn't failing me. It's in the book, I have the book, and I think that's enough.
The problem I see is, your trainer! If the trainer had admitted not knowing the answer, but would find the answer, I'd be OK with that. All they had to do is open the Road Atlas to the front pages. There it is -- the answer. Imagine that?
If your trainer let it go without an answer for your question, I question the trainer's ability to instruct new drivers. "I don't know" is N O T acceptable. Are you still in training?
'Cause, if you are, I have an idea that might wake the trainer up while helping you become more familiar with your road atlas.
Open your atlas to the front pages. Have paper and pencil ready to jot down some notes for questions to ask. Don't make the questions easy or obvious, pick the "stumpers" that SHOULD make the trainer THINK. See how long it takes that trainer to figure out HE is SUPPOSED TO ANSWER ALL OF YOUR QUESTIONS -- ONE WAY OR THE OTHER.
After about ten, or so, questions they're unable to answer, and if the trainer seems like they're going to leave it at "I don't know" -- I'd be inclined to ask What DO you know? Also, I'd ask, "Do YOU know someone I CAN ask to do YOUR job for you that might be able to answer my question(s)?
If it were reversed and it was the trainer asking YOU a question,........what would happen if your answer was "I don't know"?
That's right! It would be marks against YOU, along with a couple of paragraphs in the "comments" section -- and maybe the, "attitude" section too.
IT SHOULD BE NO DIFFERENT FOR A TRAINER
IMO, You would be doing a dis-service if YOU didn't make the company aware of the trainer's flippant attitude. That's a rip-off, and a selfish one at that.
I'd request another trainer -- post haste. Sounds more like Mr. Trainer is a "trainer(?)" for the extra MONEY, rather than producing a quality product. That is, a more knowledgeable and capable new driver.
Best of success.