If you do significant leveling side to side with just the jacks you will twist the frame. I doubt if you can hurt anything, but with aluminum who knows.
I use leveling ramps on the low side to get it approximately level side to side and use the tongue jack to get it level fore and aft. Then I use the scissor jacks on the low side to lift it up level, but no more than an inch or so. Then I snug the high side scissor jacks a bit for stability.
And I use an iPhone app Bubble Level held on one of the seams to indicate levelness.
David