Man I need to get on the stick, I forgot to check this sight latley. sorry about that.
Well I am not certain if we did the stretch on your motorhome or not but the vibration you are talking about sounds alot like a driveshaft being out of balence, sometimes what happens is the little weights they put on or washers as they look like get spun off and once it hits a certain rpm it can start to vibrate, so that is what i would do, is take it to a place that does drive shafts and have them check the balance on them. let me know what you do find out.
Thanks Jason
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