Hello Faves61 and welcome to this great forum.
To level side to side you need to put some sort of blocking under the tires on the low side before you unhitch.
So when you pull into your site before unhitching check your side to side level. You may have to pull your trailer up on some 2x8 or pieces of plywood or both.
Once you used established side to side level you can lower your front landing gear and unhitch.
Level front to rear using the front landing gear.
Then deploy the rear stabilizers.
The rear electric jacks are stabilizers only, they are not meant to raise the trailer.
Peace
Dave
Exactly as he wrote! FWIW, the hyd jacks on the front are waaaaaaay easier than the old elect ones that had to have some finagiling to adjust so they hit at same time and able to level front to back when unhooked. Since we got our BC w/ the 6pt level up, cannot believe how easy it is to use and the swiftness of it. But just unhooking is a snap. Back in or pull -thru, chock wheels, lower front legs to get 5er off truck, pull truck out. Boom done. If leveling afterwards, hit auto-level and in less than 2 minutes, boom....done. But like anything, when all systems work, it's great. When they go down, different story.