I now have almost 13000 miles on our 2004 WH chassis (2005 Winnebago Adventurer box) purchased in March 2006.) We just returned from a 4200+ mile trip to Montana, Lake Louise and Banff, Canada. The coach handled well, the noise level is acceptable (much better than any previous Class A we have owned), the heat from the dog house is practically non existant and we couldn't be happier with the coach. The noise of the aux fans when pulling western mountain grades in 95-100 degree heat is annoying; however, the temp guage never wavered and the aux fan noise soon dissipates as crests of the hill/mountain are reached, so they are doing their job. Perhaps I'm not as discerning as others regarding handling and noise/heat, but as noted, we are quite happy with our W20 chassis, engine and transmission.
2005 Winnebago Adventurer 33RV | 2004 WH W20 Chassis | 2010 Honda CR-V Toad
USAF Ret June 1990 | 42 years continuous Active Duty
49 States | 10 Provinces | 50 years RVing