Originally Posted by 
1nando
				
			 
			I get the P platers being restricted, also get that trucks are speed limited to 100kmph. 
No problem with both those 2 points,  my problem however is that if you're doing 20kms below the posted limit because your scared that your vehcile is unstable towing 3 ton or more at 100kmph or the limit for that matter then you need to consider updating that mu-x, trition, prado, ranger, everest, dmax, etc and upgrade to a vehcile that can comfortably with no concern ie yank tank, y62, range rover, 200 series (assuming they've remapped the transmission to lock up the torque converter). 
I'm of the belief that a light 2 ton dual cab or medium size SUV towing 3 ton or more is not only dangerous but stupid.  To tow that sort of weight the tow vehicle should really weigh more than 2.5 ton or more.  It's simple; the heavier the prime mover (tow vehicle) the safer it's going to be to pull a similar size load.  E.g. a y62 will be a safer tow vehicle than a mux towing 3 ton!