Annual maintenance

I have been changing the oil and fuel filters for the engine and generator once a year. Our mh gets about 2000 miles per year and other than camping, it stays in a climate controlled shop. Recently, I have had several people tell me that my maintenance schedule is too frequent. I plan on maintaining it since I do the maintenance myself. I was just wondering when other do their maintenance? Also, do you change antifreeze based on time, mileage or analysis?