My old man had a 200 with a GVM upgrade and he used to tow a >2.4T block of flats. I have a stock D3 and I've towed his block of flats, in addition to our little 1.6T tin tent.
The biggest difference in ride comfort I've found was based around suspension position and travel. His 200 is really harsh with a light load due to it being toward the top of its travel. As the load increases (cargo and TBW) the ride gets nicer. Adding the WDH bars screws around with it because it moves the load a bit between the axles. There's a sweet spot in there somewhere but I've never bothered looking for it.
On the other hand, the D3 just accommodates whatever you put on/in it and the suspension remains in its sweet spot. I do put an extra 4PSI in the back tyres when towing and loaded, but pull it out again as soon as I get to where I'm going and unhitch.
I put 330kg of lead acid batteries in the back of the D3 the other day to take to the scrapo. I felt they were there in the same way I'd notice extra passengers (more intertia under braking and corners). 330kg in the back of the 200 series with the GVM upgrade changes it from a pogo stick to mostly tolerable.
Despite the extra maintenance, the air suspension in the discos goes a long way toward mitigating all the bull**** you need to go through on a fixed suspension vehicle to make it simultaneously useful and comfortable.
MY08 D3 - The Antichrist - "Permagrimace". Turn the key and play the "will it get me home again" lottery.
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