The only reason the skycrane is somewhat stable is because the vehicle is positioned a bit far from the collision box. A tow truck would cause the vehicle to be right on top, or near, the tow truck's collision box. The loop on laggy, or any, server will just cause it to flip and fly into the air where it will spaz and cause the game to crash due to the dance between the two collision boxes inside eachother.
It doesn't matter how many people support this, if it's a bad idea it shouldn't be made. This is a bad idea, it shouldn't be made.