The length from rear wheels to tip of boom seems to be about 90 ft and height about 18 ft , that gives tailstrike pitch of rotation about 11°. I'd say they have to be quite cautious with that thing. Normal airliners rotate at about 8-11° with ample clearance.
Impressive images taken by Cook Lee during the rehearsals for the 1st Oct. parade. Quite interesting, these two Naval Aviation aircraft - a KJ-200H/Y-8W and a Y-8GX-8/Y-9JZ - both assigned to the 2nd NAD/NTC have introduced a prominent PLAN flag + title and individual numbers.