You could always just start with just front lokka, and then tyres.
I was thinking of ground anchors a while ago as those fold up one's have a lot of moving parts and don't fold up that small,
I was thinking a simple spike for your harder grounds, with a detachable blade for soft grounds.
But work and family have sorta stopped it.
You probably don't wanna be beta testing gear like this for your work but happy to have a chat and design something specific for you.
Have seen a few designs which use Star pickets, again, happy to chat.