For leveling I would suggest adding a
LevelMate Pro.
I use levelling ramps with the LevelMate (don't have any affiliation other than a happy customer). It tells you how many inches to raise each wheel; just put down that much blocks/wood/ramps/etc. and you're done.
In addition: its display is live as you pull into a campsite so you can start at the most level spot on the site.