That's exactly what they did do with the gear. The problem is that now you have a very stiff-legged and long undercarriage with relatively little oleo movement , and certainly not the luxury of trailing arm. The end result is that it's a bit like jumping off a shed roof and landing without bending your knees. The problem is that the a/c has a landing mass of 28+ tons, and all that energy has to go somewhere. maybe it's a case of the type of gear just not coping with a near 10 ton increase in mass. As plenty of others have attested, it's a lottery to get a smooth landing, and a miracle to get two on the trot.