Depending on the brand (make and model) of jacks one of three things will happen when you try to level.
1: (You hope this is the one) SUCCESS!
2: You try, but the jacks can not do it you try, but the jacks can not do it.. Well you get the idea,, Nothing bad, you just can not do it, More on this in a bit.
3: The jacks inform you "Angle too great" and do not even try.
Now: In condition #2... You might be tempted to put blocks under the low side jacks... However do this with caution.
IF you lift both front wheels off the ground,, And a gust of wind comes ripping in from the side,, Those pretzles you used to call jacks, 600/each plus labor to install (OUCH).. Do not ask how I know (That is not how).
IF you raise even one rear wheel and you have a drive shaft parking brake (Common on vehicles w/o air brakes) IT can roll forward or backward, and .... See last paragraph.
(OK I will tell you,, Hit something on the road that took out just one jack)
So if it looks like wheels are going to come off the ground.. Build yourself some stair steps as follows.
2 by width of tires
Two feet long
And three feet long
OPTIONAL (Recommended) a 4th slap at the back of it all (parking stop) this one should extend 4 inches above the top slab.. Better yeet add a half foot per layer
(18 inches, 3' and 3 1/2')
With a 4 inch something at the rear to act as a parking stop.
You need 3, one or the front and one for each of the rear (No need on tag axle if any)
Home is where I park it!