My lock with its bag weigh close to 2kg, so I am actually not that far away.
I had an early version of Chubby 4, before they started making different versions for different bikes. I paid under $500 at the time, i.e. it was a very good deal.
Is the titanium rack something you would advise to look into? Have you got a link to it? I strengthened the original Brompton rack and also put side roller wheels onto it, that really enhance the maneuverability of the folded bike, so I am not very eager to jump onto another rack, but one should always keep the eyes open.
yes. Mine turned out to be very strong (up to 30kg carry according to maker, but I never passed the 10) and 100 percent compatible with the original. I transferred the straps and both easywheels (minimods) with no problem. I don't have the link with me right now. Will look for it at home.