The ornamental design for an autonomoustandemroller, as shown and described.
FIG. 1 is a front left perspective view of my new autonomous tandem roller;
FIG. 2 is a top right perspective view thereof;
FIG. 3 is a rear left perspective view thereof;
FIG. 4 is a top rear perspective view thereof;
FIG. 5 is a front elevation view thereof;
FIG. 6 is a rear elevation view thereof;
FIG. 7 is a right side elevation view thereof;
FIG. 8 is a left side elevation view thereof;
FIG. 9 is a top plan view thereof; and,
FIG. 10 is a bottom plan view thereof.
The broken lines in the figures are for illustrative purposes only and represent non-claimed environmental subject matter. Neither the portions of the invention shown in broken lines nor the broken lines themselves form any part of the claimed design.