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Weigh your coach at each wheel location.  If I did not have 365s on the front steers I would be exceeding the weight limit on 315s.  Like Mike I also added the rear sway bar which made a huge improvement in the handling.  I then added  Road King shocks that again made driving even more pleasant!  When I hit 5 years old with my tires I too will replace them.  As Tom has said the 365 replacement extends the steers to 5 years instead of 3 for the 315s.

Take care and enjoy your coach.
Oscar