Meet the HK1000-V2 Robot from SuperDroid Robots: a heavy-duty all-terrain robot with 200lbs capacity that can transport heavy loads over rough terrain. It comes with ROS autonomous capabilities. This 4WD robot has 13-inch tiller tires. It is only 26 inches wide, so it can fit between standard doors.
The HK1000-V2 has multiple attachment points for easy modification. It has max speed of 3mph. It measures 36.5 x 26.5 x 22 inches.