Just prior to pressing the”AUTO” leveling feature, you have disconnected your 5er from the tow vehicle. So, if the left to right is way off kilter, you should place pads under the low side so your piston doesn't” run out of travel. I always try and place enough pads under to match the piston travel of the high side.
Now, I’ve not seen any mention of leveling front to back. You could have similar conditions like the left-right direction. If the site has an incline, you may have problems getting level. Once I could not get level f-b no matter what I put under the pistons. After battling the issue for a while, I had to reconnect trailer to truck and place boards under my trailer tires and then go thru the whole leveling process again, it was a pain. My problem may have been how much I extended my front legs prior to disconnecting from truck which then caused my front pistons to ran out of travel. I did learn lesson here.
2017 Jayco Pinnacle MDQS
2012 , F350 , DRW , 4x4 , 6.7L Diesel , 8’bed , CrewCab , 3.73 rar , 5250#payload , 13,300#GVWR