Thanks for everyone's posts. I followed a number of the posts on here and changed most all the fluids. Put 1500 miles since Memorial Day weekend going to the North Shore in MN and Rochester MN and the camper is running well as usual. It's good to have the piece of mind of having done the preventative maintenance for the longer trips.
Rear Differential used carquest synthetic 75W90. advanced auto $9 per quart, less than 2 quarts to fill - super easy to fill
Brake fluid dot 3 - friend had a machine to replace the dot 3 by pushing out the old fluid with the new fluid
Transmission - same buddy filtered the transmission fluid using a transmission filter system
engine oil - mobil 1 10W30 5 quarts with mobil 1 filter
coolant flush - flushed for quite a while after draining to get clear water, - went with zerex Asian coolant from advanced auto - 2 gallons around $15 / gallon
New ?: I'm sure I should change the power steering fluid. Should I change the power steering fluid? How do you changed the power steering fluid?