Would check your belt see if it tracking Ok, not to far to one side or the other ..I am not sure but mine had a vibration and is a independent suspension trike and the bolts in the axle were loose.... Lost the axle coming home from Erie 2 weeks ago !! Had to be rescued by one of my buddies..Git it home found my builder never tightened the Allen bolts up on the inner part of the drive shaft and they all worked out...Not hard to fix but I have been checking every little thing that could be a problem on down the road....As you can see mines a motor trike gladiator independent suspension !!!! Check wheel balance might have thrown a weight...May loose motor mount, hard to figure it out without having hands on !!!