We have the SSL suspension upgrade for the Plus Six.. its been great as we mainly tour in our car and it works very well for that.. However, we still bottom out now and again in France, as per the UK not all speed bumps are created the same.
The SSL rears do not have the ability for height adjustment, which is the only thing that lets their setup down.. The suspension works very well with and without luggage.. but for ride height there is no real improvement. I did ask a few yrs ago if SSL could make rear coil overs with some height adjustment for the UK, but the answer was no.
One other thing to watch out for when touring and staying in Chateau/Hotels etc.. A lot of grand double entrance gates use a raised metal plate in the middle of the road to secure them shut.. you can easily bottom out on these if you do not notice them..
dave
