Hi HippieCamper and WELCOME to the Jayco Forum!
1. I've got a 2006 JayFlight 27.5 BHS. What should my tire pressure be ?
ANSWER = Your tires should have a pressure rating on them. I usually load mine to about 2 pounds below that rating. Specially when the tires are cold.
2. Do my bearings need to be taken apart and re-packed or should I just be slowly pumping in new grease each Spring until the old grease gets pushed out ?
ANSWER = You do not have pack them or regrease them every year, but it does not hurt. Consider it "Preventative Maintenance. I do mine once a year unless I feel my bearings and hubs are running warm. Feel them when you stop for fuel or at a rest area. They should be cool to warm. You should be able to keep your hand on the hub or center of the wheel.
3. Should I be sterilizing my fresh water tank before use or can I simply run a couple tanks through it to clean it out ?
ANSWER = I usuall use bleach to flush out all the winterizing fluid. I put 1 cup per every 5 gallons of water and pour it in the fresh water tank. Using the water pump, flush the entire system. Then I fill my tank again with plain water and flush again. That usually clears the lines.
4. Do I need to lube my hitch with anything or can I simply hook up and go ?
ANSWER = That all depends on weather you lubed/greased it in the past. If you have, then continue. If not, I would not until you hear noises that do not sound familiar. Do you have a Weight Distribution System? If yes, That is what I would focus on cleaning and lubricating.
I hope this helps you and I hope you enjoy your camping adventures!!