[EricH]

Originally Posted by squirrel

I think what I said still applies...if you cover 2/3 of your bumper perimeter with bumpers, and leave the excess space on either side of the trailer hitch, you should be fine.

Or am I missing something?

Yeah, but your response doesn't fully answer the question asked.

Here's the more full answer: The maximum distance between the bumpers and the trailer hitch is 1 side of your robot, minus 12" for bumpers, minus 7" for the hitch. Assuming that you have the hitch centered, divide by 2.

You also probably don't want to have the bumpers right next to the hitch (zero distance), because the trailer tongue will hit first. You have to have the bumpers hit first. I'm not sure about the trailer distances, especially to the bumper edges, or I'd do some trig for a standard 28" and 36" robot.