Belt roller is just a precaution really, these days (the 511 belts are tougher than the 501 ones were) the belts last a fair while, but I still find the rear goes before the front. The roller is just an attempt at evening up the life between the front/rear (It's off a tr415 I think!?)
Shocks on the rear are just something I'm trying to move some weight rearwards as I run so little ballast, plus I just find it much easier working on the shocks when they are back there!
One other bonus while running on flat indoor tracks, running them at the back lowers the car due to the antisquat, its super low touring style like this
