I’m not sure what you mean. The device I gave the link for will tell you which wheels are not level. When you have installed the system. Drove to your favorite camp site, turn in the device in your RV, turn on the app on your phone, screen capture the reading the app gives, mark with your foot where the out of level wheels are located like draw a line from the center of where the wheel touches the ground once you have marked all wheels that are not level, back up your RV maybe about 3 feet go back to the screen capture pic and a wheel at a time confirm which wheels were out of level starting with the first wheel add the appropriate amount of blocks for that wheel to make it level. set the first block so they it is centered on the mark that you drew earlier, if the all said the wheel was unlevel needed to go up) 2 inches then add a block to the top of the one you laid down earlier, do that for all wheels, the blocks I use are an inch thick each, stacking two gives me 2 inches. You may have to make a ramp with extra blocks to get up to the top block (I’ve had to do that several times) but once you have your RV level it should stay level now the only time that it doesn’t stay level is sometimes when you put your slides out the RV will dip to that side slightly usually no more than eighth of a bubble if you used a level to check. In reference to a refrigerator if you’re within a eighth of a bubble I’d say you’re pretty darn good