If the bottom allows it, why don't you just stake solid. Are you in rocky terrain? If not, rebar stakes are very quick to use. Mine are 3 foot 3/8 rebar with a 4 inch T welded on the top. I use cable slid wires. I use a 16 inch 1/2 inch rebar stake with a large washer welded on top. This is a super fast setup, that allows you to punch in a set in a hurry and head on to the next step.
I used the berkshire stakes and the pogos for a couple seasons and have now gotten totally away from them. The biggest problem I had with them, was our soil is very soft and would end up getting to much slack in my drowner slide wire after a catch. Plus, not all of them could be pulled up by hand.
The rebar stakes just really fit my way of trapping better, but would not be an option in rocky conditions. Plus, I don't have to carry weights, or find rocks at the trap site to use.
I'm with Eric here, sometimes we make things alot more difficult than necessary. A couple of rebar stakes is much easier and much faster for drowning setups. I suppose if I had all day to fool around with bags and sand and hauling 10 tons of weights around it might be fun, but rebar is hard to beat for time and weight. I have used pogos also, but some of the creek bottoms I trap are hard shale and I can't always get a POGO in, so I just use rebar.