Listening for the Turbo whine?

I have the same engine in a van (work van, not RV) and can't hear the turbo except for the odd time I let off the gas and hear the tail end of the spooling for a second or less as it returns to idle. I'm probably heavier on the gas pedal than you would be in an RV, so I am not shocked you wouldn't hear the turbo at all in yours.

Do you know a good Upper State N.Y. wine?? "I wannnnnnna go to Miami"!
Seriously, if you can't hear it that's o.k. - as long as it's running o.k. O.K.? Sounds like you got a good deal there, so enjoy.

p.s. Don't forget to change the fuel filter; i.e. like regularly.