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I level both and use those pads that look like giant Legos. They work quite well and I carry enough so I can also use them on the back stabilizers if the space is way out of level. What is the advantage to leveling only one axle?
Those Anderson levelers look interesting and may be worth a try. I have a couple sets of the 'LEGOs' but seldom use them except while traveling and only for the rear stabilizer jacks. I usually carry half a lumberyard of different length 2x8 or 10 along with some 18" lengths of 4x4 or 3x4 landscape wood to crib the front landing gear to reduce their extension and lessen shake. In the CG we are doing a partial seasonal this year, been looking at how some level and support the landing gear - concrete blocks set the wrong way and tilted with no wood between the legs and the blocks, tiny wood blocks, no chocks. Ours is cribbed both ends, tire chocks plus the BAL X chocks between the wheels. As far as determining level - if the reefer is level or the two inside doors don't move, I'm set. A carpenter's level on the side as shown in that video - that's a laugh
I have the lego blocks too but the Anderson's really are simple. We just used them over the course of a 2500 mile, 6 campground trip and they simplified things so much. We had several other campers come over and check them out after we set up. Like you, the doors are the final check on level but all we use is a little 6" torpedo level and it gets us real close.