Hi Mary,I have a new 2551 that we picked up in April. I just went out to the garage and measured the height. It measures 9'-11.5" to the top of the AC, the AC is 11" tall. I am surprised that it is lower than the spec height of 10'-1"
Maybe your 2551 is 10'-1" if you had it empty, no gear, no water, just a couple gallons of gas in the tank, and then with the max tire pressure of 85psi. Kind-of-a worst case condition. Who really knows.I always store ours in the garage with a full tank of gas & gear, but no water, and 65/70 psi in the tires.