The ornamental design for a tractor-trailer tank body, as shown and described.
FIG. 1 is a side elevational view of a tractor-trailer tank body showing my
new design, it being understood that the opposite side is substantially a
mirror image thereof, except for the omission of the ladder and catwalk;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is an enlarged front elevational view thereof; and
FIG. 5 is an enlarged rear elevational view thereof.