If I'm just changing tires and it's a quick "one off, one on" type of change (where the new tire is sitting next to me, such as the summer/winter swap), I'll just use the jack, as I'm not getting under it. And I generally just jack 1 corner at a time. If I'm rotating tires, screwing with brakes or anything that would have a wheel off longer or if I need to get under it, then it goes up on stands (and I need both ends in the air at the same time anyway for a tire rotation).
I'm running Cooper Dis. S/T's in 255/85/16 on the exact same rig. These tires came in slightly narrower than the 245/75/16 G/Y Mtr's from the factory.
First let me state that E load range tires on Jeep make no sense to me. They are to stiff in the sidewalls to flex properly, when aired down, at least on a jeep.
The ride characteristics have improved dramatically, While getting similar clearance advantages. I'm also running Black Magic brakes, which have made a huge improvement.
That's the issue most of the time. I wish I could get a good tread load c 285/70.17 for my jeep.