Quick Question about Bigger Servos

[mkaa00x]

Hey guys!
okay So recently I've kinda been more active...

whatever anyways I was wondering, I wanna have a servo motor that can give me it's angle and I can move a wheel (out of 4 wheels) underneath a 120 pound robot.

Any suggestions on what to buy? I've got a program and everything for it and it has been tested on a smaller scale version, but if you were to recommend a servo that would move a wheel under a robot with ease, could you suggest which one to buy? (it's going to rotate the wheel on a XY-plane facing downwards flat to the robot)