Mine has a vibration as well. Been like that since i bought it. Sometimes a dirt dobber nest on the condenser fan blade will do it, but ours never stays outside unless we're camping, then the ac is running non stop. In our case, either the motor / fan shaft is a shade off or the fan itself is out of balance. I went up there while it was running and its obvious something is out of whack.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.