Hi Hermione,

It's relatively easy - you just need a very wide tread (tractors and other agricultural vehicles are being fitted with them to prevent soil compression). Problem is that gives a lot more friction, and slower vehicles, etc, etc.

Pete

God is our guide! from field, from wave, From plough, from anvil, and from loom; We come, our country's rights to save, And speak a tyrant faction's doom: We raise the watch-word liberty; We will, we will,we will be free!