The tub is resting on the frame, anchored at those points along with others. Yes, you can remove those bolts without bracing anything, just do one side at a time. The key there is to bathe the threads in penetrating oil (not wd-40) for a day or two first if there's any rust on the threads. You don't want to snap it off in there, or snap the weld nut loose from the body.
'01 60th anniversary ed. TJ 4.0 3 speed auto, 2.5" susp lift, 1" MML, 33X12.5X15 MTR's, weekend toy.