I dont teach high school kids but rather train them in my business after high school. And, yes they are needy, and SHORT ATTENTION SPAN. Want a paycheck but work on their phones more than at the job. This is construction, dont get paid by social media. Have to get the job DONE to get paid.
In between LA and SD, Riverside County. Likely take the 15 to the 40.
If you check out this photo page on my website you'll see where I removed a booth from our Fiver and built in a counter and custom built in office end. Then, in our second rig, I took two Sauder cheapo desks and made one longer desk that housed it all. You can tell how long ago that was by the monster all in one Printer fax copier.
You're going to run into problems with a half ton truck unless you go fiberglass egg Scamps or others. Most folks are shocked by the amount of carrying capacity they need. For a single it would be from 1500 pounds to 3000 and that's just contents added to the basic trailer. Remember pulling it, even uphill in a low gear can be done. It is emergency stops and emergency evasive maneuvers. There is no getting around the limitations of a half ton pulling any RV.
also be aware that the rubber roof and penetrations are many times not maintained properly and ten year old trailers can be a money pit as new roofs cost $5k and up. So pay close attention to any signs of leaks.