It is a good discussion topic, and lots of good reasons to use one, and just as many not to.
Just recently I've seen some Aluminium cut down ones off a Rover Mini that looked like a good option for a soft roader (Mainly road with the odd dirt track ). Haven't seen them fitted to a Moke, but assume the holes would line up.
At the Shep Muster there were a few nice after market alloy ones that looked great and had ventilation holes which would also help with weight.
I know the steel ones are very heavy and cumbersome, need to be removed to change the oil, a pain if you happen to drop something like a spanner or a nut, as well as all the things Terry mentioned etc, but I like to have one ready to fit when I want to go on a long trip where I'm not sure what I'm going to come across.
It doesn't take long to remove if I have to, and anyway, for most of the time it just sits in the shed ready to go
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HP