Newbie...what are typical annual maintenance costs?

Beyond maintenance which is pretty much covered you should also look at camping fees, any where from 20 to 65 dollars a night. The cost of gas towing it around, depending on what you pull average between 7 to 9 mpg. Plus the extra cost of driving a truck around vs a more economical car if it's your daily driver. Tires run about 90 a piece and you may have 4 of them that need to get replaced every 4 years or so. In the end it's all worth it.