The problem with benches are to bulky to transport, to heavy and you must still carry sand bags. those two guys laying in the grass can only see and shoot so far in tall grass. Furthermore, ants, ticks, snakes, nats will eat you alive laying in the grass or dirt. Buy a VRS Spec-Rest. You will be happy you did. $430.00.
....I'll admit. My BR Pivot "copy" is heavy. When we go P'doggin we generally set up and will shoot from the same spot most of the day, if not all day. Not like groundhogging where you shoot and run. "heavy" makes it solid though, and very solid it is. One Suburban, 4 guys, at least 1 dozen rifles, clothes, cooler, propane grill for lunch on the prairie, in the neighborhood of 10,000 rounds of ammo, 2 BR Pivot style benches, 2 Sinclair style bench rests, sand bags, bulls bags, couple spotting scopes, bincos, and assorted other gear.....so....those 2 benches dont take up too much space, and all this "stuff" inside the truck. We used a receiver hitch cargo box one year, and that was a hassle. Oh....and I have less than 100 bucks in the bench.(I do have a machine shop at home though)