I own a 2005 coachman class c 29 ft e450 v10 48,000 miles I took ownership of it sept 17 here we are at almost to dec 17 it has been in the shop getting the drive line taken care of. i believe it is 2 separate issues but i could be wrong. 1st issue front vibration at 28-33 mph then goes away. feels like it wants to stall out or something... 2nd issue was bad vibration and humming coming from the rear. so far I have the u joints replaced , tires balanced, and a new driveshaft put in. they said it was done test drove it still the same i think its the rear end. someone told me the previous owners might have drove it and ran out the gear oil burned up the rear end and traded it in. likey for me ... but i did catch it under the warranty so this is on the dealer thank goodness. i must say I really would like to get it out of the shop any help would be greatly appreciated .. Christine