Yes that is a very fair price for your rig in the great condition you have brought it up to...best of luck in finding an appreciative buyer.
I also sold my diesel coach for health issues a little over a year ago for $40K to a friend and it was a great deal for both of us as I was moving out of state. Mine had a little over 11,000 miles on it and had all the little improvements I have written about on this forum over the years.
For all you 'streamers out there -- get out and enjoy your rigs whenever you can as things can change...
2007 Tour Master T40C
Acura MDX toad
"It takes a great deal of time to recover from any improvement..."