I think part of the problem with tube shocks is that it's difficult, as an end-user, to select shocks that are appropriate for the inertia of your particular speedster/coupe/fordor/truck. The shock manufacturers don't publish the info that would help you figure it out. So if your vendor packages shocks that are wrong for your body type, it's hard to replace them on your own, even though replacement shocks are cheap and readily available.