I set off on my half lap with single Konis (not Raids) and inner spring airbags, with a 650kg camper canopy and a small caravan. By the time I had to do other repairs in Wodonga, I realised the bounce in the back was too much for my liking. On recommendation from the mechanic, I fitted the TF dual mounts. Easy enough job.
It wasn't until I was putting it all back together that the mechanic pointed out that my shocks were adjustable, and were set to the softest setting! I set them to the hardest setting. Given my thinking that dual mounts were now probably overkill for my mostly black-top trip, I wasn't interested in buying another set of Konis, but ended up adding a set of second hand no-names the mechanic gifted me. In hindsight, these really weren't necessary with the Konis properly adjusted, and I've since removed the no-names and have gone back to single shocks.
I've actually thought about removing the dual mounts, but I might as well leave them on in the off-chance I decide to add extra shocks for an expedition. The bottom mount does present a minor risk of being caught on something off-road, but not enough to worry me.
I guess the only other possible advantage I've considered with dual shocks is redundancy. In the event one fails, you have another already in place. On the other hand, it might make diagnosing a failed shock difficult. :confused:
I'm still yet to be convinced dual shocks are required items, particularly if running quality shocks in good condition.
Hope this helps.

