Gen 1 Exhaust header rear mounting bracket?

[Decoke Dave]

  ? I have noticed a number of mechanics doing M.O.Ts put a trolley jack under the collector box to get the front wheel off the ground to check the front wheel bearings, forks etc for play.  If this is a common practice it could be the reason so many of the rear collector box brackets fractures?  I always push the back of the seat down to allow these items to be checked. What do you think?