I carry some lightweight/stackable/screw type aluminum jackstands in the RV and a 9 Ton bottle jack. I just park the RV either level or with a slight bias toward the rear & place the jackstands under the skids. I then use the bottle jack to lift the front end & position the jackstands & release the bottle jack.

The bottle jack does a good job lifting but can settle over time so I rely on the jackstands for keeping it level.

I've never heard of a bottle jack failing catastrophically. They do tend to leak down though so you can't use them to hold the camper level overnight.

You'd think that my 7 ton RV would've come with an automatic leveling system but it didn't.