In some cases, performing repairs requires specific diagnostic testers and equipment not normally found in the typical handyman’s tool kit. Also, specific training may also be required. As an example, reconditioning an absorption refrigerator cooling unit requires not only specific training, but also specialized equipment and hazardous materials training, etc. Same thing for evacuating and recharging a roof air conditioner. But many tasks are performed by RV owners, who, with proper guidance and preparation, can indeed perform their own troubleshooting and repair tactics successfully.
The individual textbooks we use to train professional RV service technicians are available directly from RVIA and can be purchased by anyone at their online store located here.
You can order the complete set, or just the books you want. They are updated periodically, by committee, to keep up with new information and practices. I’ve had the pleasure of serving on that committee for a few years now. The textbooks will certainly go deeper than any other type of book you will find. You may have to apply the info in the textbooks to your specific equipment, but all of the current practices are usually included in each textbook.