I had access to a couple of roll bars, so I bought a scale and took weights. All weights were found by weighing myself, then myself with the roll bar, then subtracting my weight.
M1 HDHCDD: 43 lbs
M1 HDHCSD: 39.3 lbs
M2 HDSportDD (with Zerek Fabrications harness bar welded in): 34.9 lbs
Hard Dog backing plates and hardware: 5.1 lbs