At 2025 miles on a 2014 Fleetwood Expedition with all kinds of vibrations, front, rear, seat, wheel, etc. Three so-called truck tire dealers, two new tires, two new rear wheels, three times balancing, some with beads, some with lead and continuing vibrations, I finally brought the coach to a Freightliner Repair Dealer who sent the coach to an alignment shop. Brand new front Goodyear tires needed truing/shaving and on the coach balancing. They performed a front end alignment and adjusted Camber. Front end vibrations gone.
Still had that familiar vibration in the seat. Next they trued/shaved the rears and rebalanced. Wow!
SMOOTH! It seemed that the tires had flat spots from sitting up before I bought it and/or the Goodyears are ALL out of round, even the two new ones on the front. I drove over 5K with all the shimming and shaking and vibrating. Now I can relax and enjoy the smooth roads of Louisiana. Now that's a joke.