I have some anterior spurs in the C spine per 2005 MRI, but chiro said to avoid a lot of extended/extreme looking up or repeated extreme looking behind me to not aggravate it.. but no stenosis back then..

Often Work comp does deny first off , to make it harder to for any possible claimants. To discourage any frivolous claims...

We did have another member long ago that drove fuel /oil truck , long hrs, hauling the heavy hoses too..

With TOS and the other complicating factors, I suggest you interview or do some preliminary meetings with a few wc attys , run it by them and see what they say...
But don't sign on right away with any, take notes then do some research on each before selecting one..
Often they will give you a sell job, and then may not follow thru after you sign with them... TOS and complicated injuries need a good atty & good drs to back you up..

We do have a wc forum here, not super active but has info in stickys and past posts for searches.. It is quite a stressful system , but if your livelihood at young age is messed up byt the job you do, it might be something to explore.
glad you are taking clases & looking at options for change..