Wheels VS Plugs

After pondering over this for some time, I've decided to blog the discussion currently taking place within me. Should the crane have wheels or should it just have legs that literally plug themselves into the ground? Both situations have their pros and cons:

Wheels - I was thinking of something along the lines of trolley wheels, specifically designed to go over the bumpiest of 'city pavement' terrain. Made of cheap to buy rubber and very accessible. The obvious problem is their stability. Because the wheels actually roll and rotate 360 degrees it is virtually impossible for them to stay still. The only way this would be possible is with a brake type system employed on some shopping trolleys to stop them from being taken out of the centre. Where the force of a human foot would press the brake down and stop the wheel from turning. And lift the brake back off again when the material wanted to be moved. The thing is, shopping carts aren't made to carry upto a tonne in weight so they would have to be slightly modified, utilising stronger material and the joining of the leg base to the wheel would have to be immensly strong.

Plugged legs- This is the more straight forward option as the legs of the crane simply sit on the floor and plug slightly into the ground if possible or just sit on concrete. This removes the cost of attaching wheels but obviously limits manoeuvrability. Also the stability of the crane may be affecfted in certain situations. For example if the legs were not able to plug into the ground and there was a strong cross wind, because the crane would have no real leverage into the surface.. once holding a tonne of mass into a blowing crosswind could make the crane a real hazard.

After noting down both options I feel as if the wheels are a worthwhile investment. Because of the added ease of movement and stability once a brake is applied, It effectively kills two birds with one tonne of stone