The ornamental design for a hoppertrailer, as shown and described.
FIG. 1 is a perspective view of a front end and a right side of the hopper trailer.
FIG. 2 is a perspective view of a rear end and a right side of the hopper trailer.
FIG. 3 is a front end elevational view of the hopper trailer.
FIG. 4 is a rear end elevational view of the hopper trailer.
FIG. 5 is a right side elevational view of the hopper trailer; and,
FIG. 6 is a left side elevational view of the hopper trailer.
The most significant feature is the unobstructed triangular area below each of the sloped end walls of the hopper trailer as best shown the side elevational views FIGS. 5 and 6 of the hopper trailer.
The top view is not normally visible in use and forms no part of the claimed design. Also, the features shown in broken line are for illustrative purposes and form no part of the claimed design.