So I come from the car world, where in rally racing the key is quality suspension. Dual coil overs are a good way to provide both small and large shock absorption, then having a dampener in the middle seals the deal. Most setups have the ability to adjust the travel/stiffness on the dampener and also the springs.

For my plane, I want to build something similar in a pull spring configuration. it seems with some round tubes sleeved inside of one another I could create a situation where the pull causes the spring compression, which at that point would function like I'm used to.

I saw AOSS do something similar, just using a polymer instead of springs. My question, has anyone here gone down this path before using adjustable springs? It seems if I could get up to 5" of travel with adjustable thresholds I'd help the air frame quite a bit rolling over uneven terrain, and also help plant it during a really short landing. The concept seems deceptively simple, which is why I'm wondering why these things aren't floating around already.

I like your line of thought, as I am an offroad guy also and suspension is key. The way we are flying now, I think there is room for improvement in this area. The challenge is weight and drag. I don't have any suggestions for your specific design, but I feel that a "pushrod" type suspension with the shocks laying down in the truss under the seat etc. makes a lot of sense in an airplane. The components do not have to be near as heavy duty as in an auto due to the limited cycling/heat build up etc.