I will be checking them, I'm just under 30k miles. Good suggestion and glad you asked the question, I have to fix the brakes then it's time to do basic checks. I am probably overdue on other fluids just based on time instead of miles (took delivery August 2003). My biggest maintenance challenge is the truck sat for most of 2005 and almost all of 2006 due to work travel. I changed the oil, checked the tires, put Stabil in the tank, but only put about 2k miles a year for two years. Probably a good idea to change both diff's fluids and the trans, too.
2003 RAM 1500 Quad Cab Patriot Blue/Silver