We purchased an EZ Level from camping world. Has 4 legs and lights to indicate level. We put it on the floor just about anywhere and manual level to it. Green lights your level, then I check the bathroom door for swing and bump the left or right side to get it stable. Alway run the jacks down in front till they touch the ground then the left till it touches then right, then do the level to the lights. We usually wind up with all 4 wheels on the ground unless the site is really off. On auto level the front tires would be in the air as it runs the rear jacks down to almost max height then front which has to compensate for the rear jack height. A poor auto level for sure. We used the carpenter level system for a while, what a general pain in the a**, the EZ Level really works nicely and it's quick with no guess work.
As a note, from the manual on the unit, unless you have a diesel rig, the jacks have to be lowered and adjusted with the engine running. Always plug in the unit or run the generator when running the slides, never do it on house battery alone.
The question always comes up on how level the unit has to be so that the refer works properly, from an RV Expert with Goodsam, if your comfortable in the rig the refer is comfortable. The new rigs are not near as particular as the older rigs were.
JimF, CWO, US Army Ret, 100% DAV
2011 Georgetown 378TS
2008 Dodge Caliber Toad