Opening book sections are geared to the RV newbie. The information may be found elsewhere in this age of Google searches, but not as conveniently put together. The copyright date is 2010, and there have been some technology changes since then.
The electrical system power section is loaded with statements that are flat-out wrong.
First off, power inverters step up DC battery power to 120 VAC. Difley incorrectly says they reduce it down.
Next, modern switching regulators used in power inverters are usually at least 90% efficient in this step-up conversion. That is, you get at least 90% of the power out at 120 VAC that you put in at DC.
So when Dilfey states that "...[AC appliances] will use ten times as much power as DC appliances...", he's wrong again.
Power = volts * amps. Aside from the efficiency losses due to step up and step down voltage conversion / regulation (all done with very efficient switching regulators today), your three-way refrigerator (for example) will draw the same amount of power at 12 VDC as it does at 120 VAC.
The book's description of New Mexico snowbird boondocking areas is very slim. Difley recommends Las Cruces and surrounding areas, but says nothing about RV camping in the BLM-administered Organ Mountains nearby, or about area attractions like White Sands National Monument or Three Rivers Petroglyph Site.
I make these comments as a former Silicon Valley design engineer (MSEE and 25 years of experience) and seasonal NPS interpretive ranger, working at New Mexico parks (AS in Park Management). I also ghost-wrote technical articles and technical advertising copy professionally for four years, so I know to fact-check what I write, something Difley needs to do here. In addition, I was a professional wildlife photographer for three years and still shoot from time to time, so I can say Difley's descriptions of wildlife behavior are accurate.