Bob,
That KW would be a terriffic truck for OTR use, but I agree with RB7OD, it's too long and too tall for "practical" RV use. I don't know how much Rv towing Don has done, but I have been in lot's of RV parks you couldn't get into with a combination such as yours.
All parks have plenty of clearance for motorhomes, but they frequently don't have limbs cut back, or room to park a tow vehicle that size. In many parks you will be too long to maneuver when trying to back your 5er into a space.
Problems can probably be avoided in many cases, by calling ahead, but you won't be able to fit into a good percentage of parks.
I have never converted a KW. I THINK you will have to buy new single axle spring hangar brackets in order to accomplish this. That still leaves the height problem, but at least three guys have bought tall sleepers in the last 6 months. I don't know if any of them are full timing yet though.
Unless team driven, that KW shouldn't have more than 125K miles per year in service.
onezman
http://onezman.tripod.com/yourrvhaulercom