About suspension, it is best if there is both horizontal and rotational suspension because it allows the machine to handle more stress. You should also note that horizontal suspension on a ground vehicle is almost always unnecessary.
the suspension system that you already have in your guide can be used because it allows for rotational suspension as well as a tiny bit of vertical suspension. And about your part on horizontal suspension, the picture is actually of rotational suspension. Horizontal suspension is actually when you place a suspension block horizontally and call it suspension. (don't quote me on this. I'm not 100% certain)
I made a video showing just the basic ones and that goes out at 19:00 tonight. I have all the footage for the more advanced one but no voice over yet. Too busy! Btw I put in two mentions and a link to your guides!
Me and solarsupremacy has been lookin' over it and came up with some solutions for planes, but it has to perfect before I can add it to the guide. That's a WIP at the moment.
I have a post for auto-stabilizating rotors in the guide, but it's pretty weak if you use only 1 rotor. My U-5 Intelligence on the other hand uses this system with 8 rotors and you can clearly notice the auto-stabilization.