HoosierDaddy,
It depends, some of the roof supports were spot welded in place to a bracket and some were actually bolted in to be adjusted.
Look at the side and you will see it right away.
On my first top I just used a 2x4 on a floor jack BUT put down a sheet of plywood under the jack. You might push the floor down instead of fixing the roof support.
In that top I actually made extra sheet metal brackets on the sides and installed 3 extra roof supports. It really made it alot more stable and stopped the "highway rumble."
If you want, I might have an extra set of roof supports in the shed, email me and I'll send you pics on how I installed them.
Good luck!
Chris
taipeichris13@yahoo.com