Thread: Shooting rest for ATV???

Like others have posted in pictures, the best thing would be to have a bar mounted to the carrier (so it doesn't turn with the handle bars) at a height that is comfortable to shoot at and/or you can support your elbows on something.
Get some wood and just bodgy up something to work out what height is the most comfortable and practical, rather than guessing or taking someone else's measurements that may not suit you.

If it was me I'd also try to make it so it way removable (just in case it was in the way), something like motorbike handle bar clamps, or even a hose clamp type set up, that was easy to get on and off, but still held strong.