I would say "yes" if you are within a reasonable drive. I drove from Michigan (2 days each way) and it was worth the drive.
Like you, I'll do basic "house" maint but won't ever be a diesel mechanic. However, what the class really teaches you is the info you need to be an owner and talk intelligently to the mechanics who are working on your RV. You learn the basics of what the various systems are and what they do, how they can break and what to look for when they do. And many tips-and-tricks that are not covered in your normal owners manuals.
There is a ton of info covered in the class but the take-aways are even more valuable as future reference. When I attended you received a thick binder with all the presentations as well as a CD with materials specific to your chassis/engine/transmission.
Finally, the instructor, Mike, is terrific and you get an opportunity to meet with other owners.
Highly recommended.