Re: Shooting Bench, BR Pivot or Big Shooter?
Having been out there a number of times, I can completely echo what Kurt has said above. Unless you're in a very good spot that hasn't been shot before you're going to get alot more shooting by being mobile and flexible rather than stuck in one position on a bench. Prairie dogs aren't stupid. If they've been shot at before with much frequency, they know benches and trucks mean bad things.
If you must be off the ground, I might look at the DCLW tripods or something similar and a light collapsable chair that you can easily throw over your shoulder. The first year we went out we had a similar idea of using benches and wound up constructing two out of 4 layers of 1/2 in plywood laminated and screwed together on top of 3 2" steel pipe legs. They are stable but are HEAVY, wind up being used for gun cleaning mainly, and take up way too much space in the truck. I generally opt for a small backpack for ammo and water, a rifle with a bipod, and a hand tally counter so I have an idea of my hit percentage. An ez-up tent can get you out of the sun and wind if the need arises and doesn't take up much room.