Well, the mud is a lot stickier.. most are clay... well I guess depends where you go... etc clay sux as you just fill ur the tires tread with mud and then you have slick!... Is always rain there, so you will always get mud... the soil never get dry!
All the 4x4 on the photos are road legal... well road register anyway...... they drive it daily etc. No one that I know of trailer their vehicle... we don't even have towball/ trailer thing in Malaysia.
Often they do an few days/weeks on event to the jungle... etc
On top of my head, there is Borneo Safari (as n the pictures) and Rain forest Challenge which is a very big event... peoples from around the globe come and enter.
http://www.rainforest-challenge.com/
My uncle got sponsored to enter in 1997 and got 1st place. Driving his sponsored BJ Land Cruiser. I remember he took me for a test drive after he did something to it and is bloody quick!! and is a diesel! Got it off the clock in no time... and that's with 35" tires!
http://www.rainforest-challenge.com/archive/archi_97.htm
Yeh we have a lot of BJ old skool Land Cruiser.. they are very popular for offroading due to short wheel base..