It's very hard to lift a heavy load with a long rope no matter on which aircraft. The load and the rope will have pendulum effect so the multicopter can be unstable. We used D130 X8 and a 12kg trailer to do this test to prove the new power combo for D130 x8 octocopter is very stable.

We have mounted Tmotor 30A ESC and 4x F60 motor on the new Sam 220 Frame, the whole flying weight was so light that makes even a crazy thrust-weight ratio up to 10:1.