Speed, now that your rear subframes are replaced, drill the mandatory 3 drain holes per side in each frame rail plus a hole in the very bottom of each leg of the 'horseshoe' that mounts the rear suspension. Driving in wet weather (I've been in Germany!) will fill the frame rails with water thrown up by the wheels and the rails are nearly water-tight except for the big holes in the frame tops (which is how water, dirt and dropped bolts all get inside).
We use 1/2" holes in the frame and 3/8" in the horseshoe legs. After drilling, touch up the edges of the fresh holes; some go further by corking up the new holes and filling the frame rails with a few qts of old drain oil. then pulling the cork(s) and letting the frame holes drip-dry.
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