Crane feet thought process

Material and Type of foot of the Crane
Initial thoughts:
In order the portable crane to be steady, the feet need to be made from quality material and be able to hold the crane on different types of ground (for example, the ground could be uneven, even wet and muddy) without slipping and without damaging it as well.
Initial ideas:
-For the best grip, some kind of rubber can be used but it should be rugged and shouldn’t skid.
With extensive use, it can get loosened and can get harder so more slippery.
But these will only be suitable where the floor is hard.

Initial Sketch:

-My second idea was to use some sort of spikes for the crane so that it can be used outdoors where it is muddy or grassy.

They could be made from stainless steel, aluminium or from titanium.

But they cannot be used them on soft surfaces, like wood, or indoors. They could damage the floor

The disadvantage of spikes is that they are made from metal and can therefore start to rust if they are exposed to water (especially sea water). Also they should be cleaned and dried after use.

Examples found after research:

Conclusion after thinking:

The conclusion which I have come up with is to combine the rubber and spiked feet together with some rotating mechanism, which moves 90 degrees and has rubber on one side and a spike on the other. This has to be discussed with the group in the next group meeting.