We bought the 154BH new in January and did the axel flip because of height concerns. The additional height is wonderful to not worry about dragging. Our dealer installed and the cost was $51.44 for the Dexter Axle Flip Kit and $142.50 labor (1.5hrs).
At purchase we also upgraded to the Prodigy P2 brake controller and put on two Camco vent covers to allow driving with the vents open.
I may consider the 14" tires in the future.